Here is the full list of all 75 Runes of Pandemonium achievements.
Obtain one of each of the six mergeable gems.
Escape the cultist's prison.
Meet Adina at the Salt Flats.
Recruit Florentina.
Meet Polaris.
Meet Share;lock.
Win the drinking contest.
I like these characters so I gave them an achievement.
Rescue Cassandra, or don't.
Meet Alicia the gemcutter.
Have Breanne make you a Pepper Pie.
Rescue Claudia.
Find Slimeville.
Acquire Florentina's Mediator job.
Get the bonus bee scene as alraune Mei.
Reunite with an old friend you've never met.
Transform into an alraune.
Transform into a bee.
Transform into a ghost.
Transform into a slimegirl.
Transform into a gravemarker.
Transform into a werecat.
Transform into a zombee.
Transform into a rubberine.
End the zombee threat in the hive.
Stop the ritual in the Dimensional Trap.
End the Warden's cruel revenge.
Defeat the leader of the mushraunes.
Complete chapter 1.
Defeat any paragon to unlock a region's paragons.
Defeat the toughest nature-aligned paragons.
Defeat the very spooky paragons.
Defeat the powerful paragons.
Get all of the chapter 1 paragon achievements.
Find the blue keycard.
Meet Sophie, maybe ask her out?
Convert Cassandra, or help her escape.
Play the text adventure.
Meet the gemcutter in lower Regulus City.
Perform an inspection with Unit 499323.
Recharge the batteries at Cryogenics.
Meet the command unit at Serenity Crater.
Transform into a golem.
Transform into a darkmatter girl.
Transform into a latex drone.
Transform into an electrosprite.
Transform into a steam droid.
Transform into a dreamer.
Complete the Equinox Labs.
Complete Serenity Crater.
Reach Floor 50 of the Tellurium Mines, talk to the person there.
Meet SX-399.
Upgrade SX-399.
Make a decision in the Cryogenics reactor.
Solve the mystery of the Manufactory.
Complete the LRT facility.
Attend the gala with a plus one.
Get a bit of unexpected heavy support.
Reach the Biolabs.
Save Reika.
Get milked in the Biolabs.
Rescue the units in Aquatic Genetics.
Meet Dr. Maisie.
Find the evidence and prove Agent Almond's innocence.
Resolve the Epsilon crisis.
Transform into a raiju.
Transform into a raibie.
Transform into a command unit.
Get the non-canon bad end.
We can bring to birth a new world from the ashes of the old. For the union makes us strong.
Defeat a Dreamer Paragon. Good luck.
Transform into a wisphag.
Defeat Victoria and her cronies.