Here is the full list of all 17 Super Grave Snatchers achievements.
Defend the Supercrypt in Campaign
Beat the campaign on any difficulty
Beat the game on tough mode
Beat the campaign on satanic mode
Beat wave 35 on Necropolis
Listen to a friend's problems with no judgement
Defeat the eternal tree
Have 25 skeletons at the same time
Keep your soul beyond level one
Destroy everything in the sandbox level
Complete the secret ritual
Bring back your family early
Play the game once.. I'm SO SO proud of you!
Die so hard that you break reality
Ya keep dyin on me man