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