Here is the full list of all 22 The Walking Vegetables achievements.
Open 20 health boxes at full health.
Die 10 times
Survive for 20 waves in SynthWave World
Hit a grenade with your melee and defeat 30 enemies with those grenades in total
Defeat 100 enemies using their own bullets
Destroy 3000 objects in total
Go though one campaign only using your melee weapons
Enter the boss arena with one health, and slay the beast
Unlock 5 weapons
Push 100 vegetables over the edge.
Go through one campaign without using your weaponwheel
Complete one level without picking up any guns, melee weapons, or items.
Go through the first part of a campaign without stopping
Unlock all doors in one campaign
Complete three buildings in a row without hitting anything destructable
Collect 100 RadRocks in total
Un-live 150 vegetables using fire
Blow up enemies after your death
Win 10 boss battles
Defeat Coco & Loco
Speedrun your way through a campaign in 15 minutes
Defeat 30 enemies in total with the last bullet of your gun