There are a total of 45 evidence collectibles in Hitman: Absolution. Finding all of them will earn you the Information is Power trophy / achievement. They also give you other small awards such as bonus points and increased instinct. On high difficulties the bonus instinct will come in handy! Finding evidence is also required to complete the challenges of each level. The "Evidence Collector" challenge keeps track of your progress. You can check it out by clicking on "Unlocks" in the Single Player Menu. After collecting the evidence it will be saved automatically and you can quit the level immediately.
The instinct ability will highlight nearby evidence and makes it easier to find everything.
IMPORTANT: Your challenge progress will not be saved on easy difficulty! The trophy / achievement won't unlock either. You have to play on normal or professional.
A Personal Contract
#1 - Cliffside
After going over a ledge you will have to disable the security system. In the room of the security system you can find the evidence on a black colored server.
#2 - Mansion Ground Floor
In the center of the mansion is a huge room. Look for the evidence on a small round table. There is a flower vase on the table and it's located between two wellness chairs.
The King of Chinatown
#3 - Chinatown Square
It's under the circular pavilion where your main target is located. Look on a stone table.
#4 - Terminus Hotel
After entering the building look to the right. There is a little room that looks like an exchange office. Look for a video tape inside this room.
#5 - Upper Floors
After going up the stairs look for a room with a piano and lots of round tables. Open the door to enter anoter room that has a long table and several weapons inside. The evidence is on the long table between some of the weapons.
Run for Your Life
#6 - The Library
This one is in the middle of the first room of the library. Look for it on a wooden table under a sclupture.
#7 - Sangri-La
Immediately after entering Shangri-La go through the first room and turn left. You should now be in a room with many plants. Next to some candles is the evidence.
#8 - Train Station
After taking the elevator down to the train station you can only go one way and open a door in front of you. You will have to go through a corridor where lots of police guards are standing around. There is only one table to the right. On this table is the evidence.
Hunter and Hunted
#9 - Courtyard
After going outside you will see several police cars. On the hood of the police car in the middle is the evidence.
#10 - The Vixen Club
After entering the club take out the first two male persons that you see. One of them has a key that is needed to open a door. The door is on the left side of the first corridor. Open it with the key and go up the stairs. The video tape evidence is sitting on the table.
#11 - Derelict Building
After entering this area you will see a group of police guards. The evidence is on the floor where the guards are standing.
#12 - Convenience Store
When you go through the store look for a counter on the right, next to a table with red balloons. There is an Asian woman standing behind the counter. The video evidence tape is on the counter.
#13 - Loading Area
After entering the small Loading Area go straight and through a door on the left. You will now be inside a small office. The evidence is in this office on a table.
#14 - Chinese New Year
Keep going into the direction where level 2 started. At the end of the market square is an alleyway to the right. Go past the police guard and you will see the evidence on the street.
#15 - Orphanage Halls
After leaving up the elevator you have to climb up a wall. Intead of going straight you need to go to the right and down the stairs. Keep going until you come to the reception. On the front desk is the evidence. There are also some thugs in this room. You might want to take them out first to avoid being spotted.
#16 - Central Heating
After entering the dark corridor of the central heating you will see two thugs. The evidence is sitting on a box to the left of the thugs.
Welcome to Hope
#17 - Great Balls of Fire
Immediately after this level starts you need to turn right and go into the restroom. Use the small air vent in the left corner of the restroom to reach the secret room with the evidence. The evidence is inside the video recorder.
#18 - Gun Shop
First of all you will need to get a special key. This key is on a table behind the sales clerk. Get it and run up the stairs. Drop down to a trench and keep going until you see a door to a bunker. Inside the small bunker is the evidence.
#19 - Streets of Hope
From where you start go left and inside a big garage in front of you. Go up the stairs to find the evidence that is sitting on a cupboard.
#20 - Barbershop
This one is inside the building where you have to capture Lenny. Look for a big TV on the lower floor. The evidence is on the TV.
#21 - Dead End
When you see the big gate at the end of the road that says "Dexter Industries" you need to go inside the wooden building to the left. There are some monitors and a video recorder. The evidence is inside the recorder.
#22 - Old Mill
After going up the first set of stairs you will see two guards sitting in front of a TV. The evidence is on the TV. The guards will notice you if you don't get rid of them.
#23 - Descent
Soon after entering the cave you will have to go through a locked door that requires a security key. After this door you need to go down the stairs and the evidence can be found on a table to the left.
#24 - Factory Compound
After leaving the caves and entering the main building (where your next objective is located) you can find this evidence on the front desk. It's pretty much exactly where the objective marker is shown.
#25 - Test Facility
When you see the huge bones & skull symbol on the wall you need to go up a ladder on the left corner of the room. Once you reach the upper floor go to the central room and you will find the evidence on a small table near the wall.
#26 - Decontamination
Once you enter the room that says "Showers" keep going straight until you find another small room with some guards. The evidence is on small table inside this room.
#27 - R&D
After reaching the ground level of this gigantic room you will see some sort of power station and lots of dental chairs. The evidence is behind some monitors near the right wall.
#28 - Patriot's Hangar
When the level starts you can see a party bus. Go behind the bus and through the little path between the crates on the right side. Behind all these crates is the evidence.
#29 - The Arena
After leaving the cage turn left. You will see a bar. Go through the door behind the bar and up some stairs. On top of the stairs turn right and go into a small room where 3 guards are standing. The evidence is next to the couch.
Attack of the Saints
#30 - Parking
After defeating the first two Saints you need to go down the stairs. You will then be in the courtyard. There is a blue car and on a box next to this car is the evidence.
#31 - Reception
After leaving the reception you can see a gas station. In front of the gas station are some boxes and on one of these boxes is the evidence.
#32 - Cornfield
When reaching the cornfield stay on main path. There are two caravans. Between the caravans are some boxes and on one of these boxes is the evidence.
#33 - Courthous
From where the level starts turn around immediately and go into the room that has a sculpture in the center. Keep going left and into the Security Room. Here you will find the evidence on a table.
#34 - Holding Cells
The Holding Cells are a very small area. You can only go into one direction. You will come to a metal door with a red warning sign. To progress you actually need to pickpocket this door. Instead of doing so, look for the evidence on one of the tables to the left.
#35 - Prison
After opening the prison gate go down a set of stairs and look out for a very small room on the right side of the corridor. It's very dark inside this room, but the evidence is next to a dumpster.
#36 - County Jail
This one is in the police station office room. Before you exit the building through the big wooden doors, go right and the evidence will on a table in front of a computer monitor.
#37 - Outgunned
Take out all attackers and go down the stairs. On a black box in front of an armored, black SWAT vehicle is the evidence.
#38 - Burn
You will come to a room that is completely covered by a smoke screen. A lot of wood is stored in this room. Before going to the next section of the building, look for the evidence on a box.
#39 - Hope Fair
After going outside lots of people will run away. You will now be in some sort of market square area. Go to the end of this market square and stick to the right side where all the destroyed cars are standing around. The evidence is sitting on some boxes on the right side of the area.
#40 - Blackwater Park
From where this level starts stick to the right wall and keep running for 1 minute until you reach the end of the road. There is a car and a small guardhouse. Inside the guardhouse is the video tape evidence.
#41 - The Penthouse
After entering the Penthouse go left until you reach some sort of exhibition room that has samurai armors and even a dinosaur skeleton. There are lots of guards in this room. Look for a small couch on the left side of the room. On this couch is the evidence.
#42 - Blackwater Roof
After going up the stairs go to the end of the area where the helipad (your main objective) can be seen. Enter the room under the helipad to find a special key. Go back to where you came from (but not down the stairs) and and look for the door that needs a key to be opened. In a room behind this door is the evidence.
#43 - Cemetery Entrance
After the level starts, jump down the ledge and keep moving down the street. On one of the last stone structures on the right side of the street is the evidence.
#44 - Burnwood Family Tomb
After entering this area you will see some ruins in the center of a courtyard. Go past these ruins to find the evidence on some boxes.
#45 - Crematorium
The last evidence is on some boxes on top of the Crematorium Hill where you had to eliminate 3 main targets.