Here is the full list of all 26 Undoing achievements.
You have died!
You started your first game!
Play the game with 10 friends.
Launched the game.
Fire a full magazine without interruption.
Fire 1,000 bullets.
Fire 10,000 bullets.
Fire 100,000 bullets.
Fire a full magazine into a monster without interruption.
Join 10 multiplayer games.
Join 100 multiplayer games.
Join 1,000 multiplayer games.
Host 1 multiplayer game when another player joins you.
Host 10 multiplayer games where another player joins you.
Host 100 multiplayer games where another player joins you.
Host a full multiplayer server!
Kill 10 monsters!
Kill 1,000 monsters!
Kill 10,000 monsters!
Lose 100 health!
Lose 10,000 health!
Lose 1,000,000 health!
Fall 100 times!
Accumulate one mile of distance in one game.
Play a game for 1 hour straight without dying!
Jump 15 Times