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