Here is the full list of all 27 Peregrin achievements.
Reach the first monolith
Reach the second monolith
Reach the third monolith
Reach the fourth monolith
Reach the fifth monolith
Reach the final monolith
Possess a creature 10 times
Possess a creature 50 times
Possess a creature 100 times
Possess every possible creature
Force an enemy to kill their ally
Activate the last totem in your journey
Clear a battle zone using only a single heavy enemy
Complete Chapter 1 without dying
Give yourself the upper hand in Chapter 2's final battle
Kill an enemy using a sentry turret in Chapter 5
Die 5 times
Activate 5 totems
Activate 10 totems
Activate 20 totems
Discover an investigation point
Discover all investigation points
Complete the Chapter 3 generator puzzle first try
Complete the Chapter 5 plane flame puzzle first try
Make your way across Chapter 3's crucibles with 15 or fewer button presses
Use a light enemy to kill a ranged enemy
Spend 60 seconds on a single vista scene