Here is the full list of all 17 PixelJunk Monsters 2 achievements.
To you who mastered it all!
You mastered the Ice Tower! It doesn't hurt to be prepared does it?
You defeated an enemy with a Shell Attack. No need for towers now, right?
You bought 20 different outfits. Now you're ready for the Tiki fashion show!
You have acquired 10 Rainbow Fragments. Keep up the good work!
You collected coins and gems from trees 50 times. Where do you want to look next?
You defeated 100 monsters with fruits. Beware of explosions!
You built 500 towers! You're quite the craftsman!
You upgraded towers 500 times! Your skill has improved!
You defeated 5000 monsters! Nothing can stop you!
You have collected 100,000 coins! How much do you have left in your wallet?
Wow! You cleared all stages in "Fun"!! It's amazing that you did all of that alone.
Wow! You cleared all stages in "Tricky"!! Now monsters fear you.
Oh! You cleared all stages in "Mayhem"!! You're the best!!
You have obtained all the rainbows! This moment shall be preserved in history books.
You cleared all stages at Encore Peak! The forces of the universe are now on Tikiman's side.
You cleared all stages where Monokuma appears! Tikis won’t give in to despair!