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