Here is the full list of all 16 Pity Pit achievements.
Dig 50 blocks
Dig 100 blocks
Dig 250 blocks
Kill 10 enemies
Kill 20 enemies
Kill 30 enemies
Reach 9 lifes
Pick up a shovel
Pick up a pickaxe while using a shovel
Buy a pickaxe or a shovel
Buy 3 bombs
Buy 5 bombs
Buy 10 bombs
You beated the devil!!!
Actually, she died...
She didn't get hurt, thanks to you!