Here is the full list of all 20 Lone Bastion achievements.
Buy your first drone
Buy every drone in the shop
Buy your first mod
Buy every mod in the shop
Survive 3 minutes in normal or hard difficulty
Survive 5 minutes in normal or hard difficulty
Survive 8 minutes in normal or hard difficulty
Survive 10 minutes in normal or hard difficulty
Survive 15 minutes in normal or hard difficulty
Kill 500 enemies
Kill 2,000 enemies
Kill 5,000 enemies
Kill 10,000 enemies
Kill 50,000 enemies
Play the tutorial
Survive 3 minutes in nightmare difficulty
Survive 4 minutes in nightmare difficulty
Survive 5 minutes in nightmare difficulty
Use a completely randomized loadout in a game