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