Follow the indicated steps to earn the corresponding Steam achievement. To view your achievement progress and stats, open the Steam client, select "Community", then search for the game hub for "Eryi's Action". Click the "View Stats" option in the drop down list, then select the option that displays the achievements for your account.

Achievement	How to unlock
Abducter	Go into Kerota's house.
Birds	Collect too many birds.
Blocklike	Hit a certain block too many times.
Blocklike 2	Activate the secret spinning block.
Burnt	Be defeated by burning.
Challenger	Dodge the 3rd attack to the left.
Electrobolt	Activate the electrobolt.
Electrocuted	Be electrocuted.
Fake Block	Hit a spiky block.
Fast	Win easily.
Fire	Pick up a fiery ghost.
Fished	Be defeated by fish-ramming.
Frozen	Be frozen solid.
Game Cleared	Clear Eryi's Action.
Gamer	Clear EX mode.
Goal Crusher	Destroy a goal flag.
Hidden Floor	Enter a hidden floor.
Hot	Be defeated by hot water.
Ice Explosion	Make a freezing device explode in the water.
Jewel Collector	Collect all the jewels.
Metal Dished	Be defeated by a metal dish.
Self-destructed	Self-destruct in the Final Stage.
Snowballed	Be rolled into a snowball.
Snowmanned	Become a snowman.
Special Attack	Enter a command in the Artie fight.
Spikes	Reset encroaching spikes.
Sprinkler	Drop a sprinkler in a spa.
Stage 0	Clear Stage 0.
Stripped	Be defeated and declothed.
Super Player	Clear EX mode with no defeats!
Swimmer	Swim through the middle of some water.
Twinkle, Twinkled	Become a star.