1. Story-Related
1.1. Faster Than Light – Complete Memory Sequence 4 in under 9 minutes
1.2. Sharp Shooter – Clear the Mortar Guards in Sequence 8 without taking damage
1.3. Faster Than An Elephant – Complete Memory Sequence 9 in under 7 minutes

2. Miscellaneous
2.1. Leave No Trace – This is a miscellaneous test description
2.2. Two For One – This is a miscellaneous test description
2.3. Gone In A Flash – This is a miscellaneous test description

Faster Than Light
Complete Memory Sequence 4 in under 9 minutes.
Beating the time requirement for this trophy isn’t too horribly hard. You can complete this sequence in about 8 minutes, so there’s some room for error. You should run at all times (don’t walk slowly). In climbing sections press X (PS4) / A (Xbox One) to move quicker. The fastest way to kill enemies is to throw a smoke bomb, then perform an assassination while sliding under them.
If you took too long during a section you can restart the checkpoint. Restarting checkpoints does not add to your time.

Sharp Shooter
Clear the Mortar Guards in Memory Sequence 8 without taking any damage.
This can be done at the very end of Memory Sequence 8. After climbing a tower some enemies shoot at you with big cannons (mortars) from the ground. Here you will automatically pick up a Sniper Rifle and have to kill the mortar enemies. To get the trophy you must kill them really quickly before they can fire at you. There are 5 enemies. Activate eagle vision to see them more easily. Just wait until they reach the mortar, then they will stand still for a moment and you can easily kill them.
You can restart the checkpoint if you have taken damage from the mortars.

Faster Than An Elephant
Complete Memory Sequence 9 in under 7 minutes.
Beating the 7 minute time requirement is quite easy. In this video I show you how to do it in under 6 minutes for the “increased Smoke Ammo” upgrade. You can save a lot of time by jumping instead of running. Hardest part is the boss fight at the end. Sometimes the boss runs away and hides in the crowd which can cost you a lot of time. Best way to deal with this is by restarting the checkpoint when it takes too long.
Furthermore, cutscenes DO NOT add to your time. There’s no penalty for restarting checkpoints.

Leave No Trace
Dispose of 100 enemies using Helix Blade.
Helix Blade is unlocked after beating the story. You can then easily farm this at the first two enemies in Sequence 3 (New Game Plus). There’s a purple Helix Boost at the start. Pick it up and assassinate an enemy. During the assassination repeatedly press Triangle (PS4) / Y (XB1) to trigger the Helix Blade. If done correctly it will make the enemy disappear into smoke. You can speed things up by throwing a smoke bomb at the two enemies so they are easier to assassinate. Simply restart the checkpoint to farm the rest of the kills.

Two For One
Multi kill 200 enemies.
A good place to farm this is at the end of sequence 6 in the room where you have to kill 10 guards. There are 2 guards standing in the middle of the room. Assassinate them from the ceiling above or sneak up from behind. Reload the checkpoint after performing the multi-kill. A multi-kill means you have to assassinate them both out at the same time by pressing Square (PS4) / X (XB1).

Gone In A Flash
Have 100 enemies pass by you whilst using Helix Blend.
The best farming spot for this is in Memory Sequence 7 of New Game Plus (second playthrough). After reaching the first checkpoint there will be 4 enemies coming out a door. Jump in front of the door before they spawn and press Trianlge (PS4) / Y (Xbox One) to blend in with the background and become invisible. Let the enemies walk past you and restart the checkpoint. You must pick up the purple helix boosts before the first checkpoint.
Helix Blend is unlocked in Sequence 8 on the first playthrough. This means it won’t be available on Normal difficulty during Sequence 7. You must be playing New Game Plus mode for this farming method to work!