In the Picture all collactable Items are noted. some Wickerlings are in chests.
for the rest items you have to do alle quests (3 packets+30maiboxes, sporesquest, willoquest)

for 100% in the savefile you also need all violet bumper(that cost 80)
3 of them are missable if you use other ways to get to these areas: right next to the house where you steal the leech (this one is just for a wickerling which you can get also from the other side), one in the village under the toolbox(you can get up there with blue and green beeline, or even with a slugjump), one at the entry to the zone of the monkey(you can enter this area underwater from the underlings)


all scarabs for the achievment: