Full list of all 29 Many Faces: Console Edition achievements worth 4,000 gamerscore.
The base game contains 14 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 15 achievements worth 3,000 Gamerscore.
Kill 3 bosses
Kill 2 bosses
Kill 1 boss
Collect 10 hearts
Beat stage 3
Collect 5 hearts
Kill 48 enemies
Beat stage 2
Kill 24 enemies
Collect 1 heart
Kill 8 enemies
Beat stage 1
Collect a Hat (excluding tutorial)
Complete the tutorial
Kill 64 enemies
Kill 96 enemies
Collect 15 hearts
Collect 20 hearts
Beat stage 4
Collect 23 hearts
Collect 26 hearts
Collect 29 hearts
Collect 32 hearts
Collect 35 hearts
Kill 110 enemies
Kill 120 enemies
Kill 130 enemies
Kill 140 enemies
Kill 150 enemies