Here is the full list of all 12 Crab Digger achievements.
Break 100 blocks
NEW_ACHIEVEMENT_DESC_1_0
Break 500 blocks
NEW_ACHIEVEMENT_DESC_1_1
Collect 100 coins
Collect 1000 coins
Reach level 10
Reach level 25
Buy 5 hats
Buy all hats
Break 5 picks
Break 100 picks