Here is the full list of all 40 BoxesWithGuns achievements.
Buy 10 weapons
Lose 50 boxes
Buy 5 weapons
Submit a score to the leaderboards.
Upgrade a weapon 10 times
Check out the ranks
Kill 100 enemies
Survive a song without destroying an enemy
Survive a song but destroy not more than 3 ememies
Find and submit a bug
Finish 1 game without hitting the wall
Lose a game in 5 seconds
Start the game
Kill 1 000 enemies
Kill 10 000 enemies
Kill 100 000 enemies
Kill 1 000 000 enemies
Play at least 5 hours
Lose 100 boxes
Lose 250 boxes
Lose 1 000 boxes
Upgrade a weapon 100 times
Upgrade a weapon 1 000 times
Upgrade a weapon 5 000 times
Buy 100 weapons
Buy 1 000 weapons
Lose a game without losing a box
Total Playtime 40h
Move your mouse 10 kilometers inside the game
Move your mouse 20 kilometers inside the game
Move your mouse 50 kilometers inside the game
Collect 10000 Nuggets
Collect 50000 Nuggets
Finish 10 games without hitting the wall
Collect 75000 Nuggets
Collect 100000 Nuggets
Collect 150000 Nuggets
Collect 250000 Nuggets
Collect 500000 Nuggets
Collect 1000000 Nuggets