Here is the full list of all 30 Bugsnax achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Complete the main story of Bugsnax.
All of the Grumpuses survive.
Collect 10 hats.
Fully furnish your hut.
Catch 100 unique species of Bugsnax.
Stun a Bugsnak with the Trip Shot attached to your Buggy Ball.
Stun a flying Bugsnak by launching another Bugsnak at it.
Fully transform every Grumpus.
Scan the Snaxsquatch.
Scan a Grumpus after saucing them with cheese.
Empty one biome of all its Snakpods.
Complete all of the side quests.
Defeat all of the Legendary Bugsnax.
Transform a Grumpus with Bunger, Fryder, and Sodie.
Return every Grumpus to Snaxburg.
Watch all of Lizbert's video diaries.
Transform Gramble.
Donate max amount of Bugsnax to Gramble's ranch.
Transform a Grumpus with Scoopy, Banopper, and Cheery.
Interview every Grumpus.
Fully transform a Grumpus.
Catch 50 unique species of Bugsnax.
Solve the secret of the lava cave or the secret of the dunes.
Check behind the waterfall for secrets.
Catch more than one Bugsnak in your Snak Trap at once.
Steal Beffica's diary from her cave.
Catch 25 unique species of Bugsnax.
Find your way to Snaxburg.
Catch your first Bugsnak.
Complete the adventure at Broken Tooth.