Here is the full list of all 18 Bacon Rebellion achievements.
Kill 1 of every enemy
Kill 100 Enemies
Kill 5000 Enemies
Kill 1000 Enemies
Try every weapon
Clear the map of obstacles
Die without killing any enemies
Unlock all the hats
Gain a combo of 10x
Gain a score of 30000
Gain a score of 10000 in 1HP mode
Survive for 10 minutes
Get back to full HP after having less than 10HP
Have 100 enemies on screen at the same time
Have 5 powerups active at the same time
Have 160 max HP
Kill a frozen enemy with fire
Kill the toilet pig