Here is the full list of all 21 The Living Dungeon achievements.
Watch 200 wretched die
Beat Level 3
Manage to not screw up the first level.
Beat Level 12
Beat Level 7
Beat Level 19
Have 20 shadows, and 20 sentinels destroyed
Finish the game
Finish the game with all the bonus objectives
Complete 8 bonus objectives.
Complete a multiplayer game.
Force a draw or sudden death as a human DM, with at least 1 A.I. opponent.
Kill two members of the same team on your turn.
Kill someone indirectly with a shadow.
Stay alive for the duration of a multiplayer game with at least 3 A.I. opponents.
Assasinate a player that isn't your target in a game with at least 2 A.I. opponents.
Win a multiplayer game on the DM's turn.
Win a multiplayer game with the DM biased against you and at least 2 A.I. opponents.
Win a game without directly killing anyone with at least 3 A.I. opponents.
Win an assassination game with 6 or more players.
Cause the death of two other players on your turn.