Here is the full list of all 15 VolChaos achievements.
Find the mythical Fun Sloth.
Finish all expert levels.
Finish all normal levels.
Finish level 49 in under 49 seconds.
Collect all gems in 10 levels.
Complete an expert level.
Get killed by a fire bat.
Get the flag after lava has reached it.
Die by landing on some spikes.
Die 100 times in lava.
Die 100 times.
Die 10 times on 1 level.
Finish a level in under 7 seconds.
Collect all gems in a level.
Complete a level without dying.