Here is the full list of all 17 Memory Lost: Chapter One achievements.
First capture mind completed
Complete the ultimate resettlement training
Fall in front of a pirate without shooting a bum
Defeat the pirate
Defeated the pirate in a fair fight. Without a gun
Find and open the chest in the sledgehammer room
Defeat the Rat boss
Get to the hub location of the mind for the first time
Blow up the barrels at the disco
Use dash to jump over the poison pool
Change into a sniper across the abyss
Blow yourself up in a kamikaze
DO NOT kill the grandma-watchman
We save the captain, the liaison gets the money
Captain is executed by cultists
Kill the Two-Phase boss
Use Ult 10 times