Here is the full list of all 9 Toast Time achievements.
Unlock all of the customisations.
Unlock all of the weapons.
Casually bellyflop an enemy into the clock.
Beat a level without firing any breads.
Play for a total time of 21122.012 seconds.
Hit a crate as it tumbles off a platform.
Use your toasty mass to kill an enemy.
13 toast on-screen at once.
Complete the Ironman survival mode.