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