Here is the full list of all 18 Elems achievements.
100 diamonds are collected
500 diamonds are collected
1000 diamonds are collected
Level “Hell” is done
Level “Ice” is done
Level “Jungle” is done
Level “Water” is done
All the levels of the game are done
The riddle level is done
You died of the Fire Elem
You died of the blow from above
Your life energy is over
You’ve gone through 25 teleports
You’ve put out 25 Fire Elems
You’ve burnt 25 Stone Elems
You’ve activated 25 Gravity Elems
You managed to finish the level with only 1% of life energy
You have restored 1000 units of energy