Here is the full list of all 22 UltraGoodness achievements.
Defeat the Office Guy
500 enemies killed by flames
250 enemies killed by flames
100 enemies killed by flames
Defeat the Machines of Terror
Kill 5 000 enemies
250 bombs thrown by the player
Defeat the Tree of Evil
Catch bunnies having fun
Kill 2 500 enemies
50 enemies killed by flames
10 000 bullets fired by the player
100 bombs thrown by the player
5 000 bullets fired by the player
Unlock all companions
50 bombs thrown by the player
Kill 1 000 enemies
2 500 bullets fired by the player
Kill 500 enemies
Be friends with Satan
1 000 bullets fired by the player
Kill 100 enemies