Here is the full list of all 13 Oh No! Bugs! achievements.
Reach Max Lvl
Buy Every Shop Item
Buy The Spidey From The Shop
Get A 10 Kill Combo
Buy The Hovery From The Shop
Kill 500 Bugs
Buy The Dozey From The Shop
Kill 250 Bugs
Buy The Buggy From The Shop
Kill 100 Bugs
Get A 5 Kill Combo
Kill 50 Bugs
Kill 10 Bugs