Here is the full list of all 34 LUNARK achievements.
You found secret location #2!
You've literally hit a wall.
No droids were harmed during this tutorial.
You found secret location #1!
Fall from two levels above without grabbing anything and you won't be getting up.
You found secret location #3!
You defeated the Zirneklis Queen (basically a giant spider).
Bring Hugg 3 $hells and you’ll get a heart!
You recovered a strange artifact.
You found secret location #4!
You found secret location #5!
You upgraded your weapon!
You found secret location #6!
You found and helped Smockey!
Nothing’s more relaxing than a gentle purr.
You found secret location #7!
You found secret location #8!
You found secret location #9!
You destroyed the Swordroid gang.
You solved the puzzle and got a map.
You found secret location #10!
You found secret location #11!
The Zirneklis Queen is now definitely dead.
None of the guards spotted you.
You brought hope to a nice couple.
The king of basketball! All you need now is… a ball.
That was a hard place to reach.
You petted all the doggos!
You've read all of the villain's diaries.
It took some time, but in the end you're a great dancer!
You maxed out your number of hearts.
You maxed out your gun specifications.
Congratulations! You finished the game!
Impressive! You accomplished everything in LUNARK!