Here is the full list of all 14 Tanky Tanks 2 achievements.
FInish Level 10
FInish Level 20
FInish Level 30
FInish Level 40
FInish Level 50
FInish Level 60
FInish Level 70
Collect all coins in Stage 1
Collect all coins in Stage 2
Collect all coins in Stage 3
Collect all coins in Stage 4
Collect all coins in Stage 5
Collect all coins in Stage 6
Collect all coins in Stage 7