Here is the full list of all 104 I Shall Remain achievements.
Plant 500 mines
Reach level 40 with main character
Throw 500 grenades
Finish the story on Impossible difficulty
Finish the game with "Chieftain" perk
Kill Halfing Aberration
Kill De Rossi
Kill Bunny
Kill Kramer
Kill Mantis Aberration
Kill Hetzenauer
Kill Geronimo
Kill Crawler Aberration
Kill Guardian
Kill Big Brother
Kill Monk
Kill Child
Kill Freddy
Kill Martha
Unlock C.J.'s second ability
Kill Renan
Recruit C.J.
Kill Krass
Kill Hunterlag
Unlock Jim's second ability
Reach level 30 with main character
Plant 100 mines
Read 30 books
Use mechanical actions 100 times
Kill Vilebyrd
Kill Newborn
Unlock Thomas's second ability
Recruit Jim
Kill Wilson
Kill 5000 infected
Kill Reaper
Throw 100 grenades
Recruit Thomas
Kill Strider
Plant 50 mines
Kill Lisard
Throw 50 grenades
Reach level 20 with main character
Use medical actions 100 times
Unlock Cathy's second ability
Read 20 books
Kill Carrie
Recruit Cathy
Kill Linger
Meet Julia
Unlock Tommy's second ability
Unlock Patrick's second ability
Use mechanical actions 50 times
Kill Ghunter
Read 10 books
Unlock Andrea's second ability
Repair the tank
Recruit Patrick
Kill Murthog
Kill Infant
Reach level 10 with main character
Recruit Tommy
Recruit Andrea
Use mechanical actions 10 times
Meet Dr. Andre Gratia
Kill Coloth
Plant 10 mines
Kill Realdead Man
Use medical actions 10 times
Use medical actions 50 times
Kill 50 elite infected
Kill 100 elite infected
Kill 500 elite infected
Kill 1000 infected
Throw 10 grenades
Kill 10 elite infected
Read one book
Kill 500 infected
Kill Beizel
Kill 200 infected
Finish Prologue
Find Michael, your brother
Kill Gobber
Kill 100 infected
Kill one Infected
Use medical actions 500 times
Use mechanical actions 500 times
Finish the story on Easy difficulty
Finish the story on Normal difficulty
Finish the story on Hard difficulty
Finish the story on Easy difficulty (Hardcore)
Finish the story on Normal difficulty (Hardcore)
Finish the story on Hard difficulty (Hardcore)
Finish the story on Impossible difficulty (Hardcore)
Finish the game without using any unique weapon
Finish the game with "Civilian" perk
Finish the game with "Athlete" perk
Finish the game with "Fighter" perk
Finish the game with "Detective" perk
Finish the game with "Policeman" perk
Finish the game with "Trooper" perk
Finish the game with "Agent" perk
Finish the game with "Sapper" perk
Finish the game with "Survivalist" perk