Here is the full list of all 49 Atelier Ryza: Ever Darkness the Secret Hideout achievements.
Earned all trophies.
Became a Braver.
Got Ryza's battle level to 50.
Activated everyone's Fatal Drive.
Wrote a record of every exploration.
Found and installed all Power Reactors.
Created an item with Item Level 99.
Got Ryza's alchemy level to 99.
Obtained all recipes.
Obtained the Revelation Book.
Created a bottle with Gathering Synthesizer Level 51.
Completed requests to get Peter to interview you.
Saved the goat you met on your travels.
Found all treasure chests.
Found one treasure chest.
Wrote a record of one exploration.
Defeated the King of Storms.
Defeated the Noble Paladin.
Defeated the Eternal Sculpture.
Defeated the Mirage Master.
Defeated the Savage Assassin.
Defeated the Shining Puni.
Defeated the Queen of Shadows.
Defeated all 5 Great Elements.
Helped create Rasen Pudding.
Saw everyone move on to chase their dreams.
Created the Crimson Stone and saved Kurken Island.
Defeated the Queen of Darkness.
Created the Bomb Rod.
Entered the Kurken Bunker.
Visited the Holy Tower of Pynnor and learn the truth.
Installed the Multiplicauldron at the secret hideout.
Helped Empel regain his former strength.
Created the Bug Net.
Created the Fishing Rod.
Installed the Gathering Synthesizer at the secret hideout.
Spent the night camping in the Underworld.
Laid eyes on the Underworld.
Learned about the history of Ryza and the others.
Created the Hammer.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
Built a secret hideout for everyone.
Created the Woodcutter's Axe.
Witnessed the rise of a strange beast.
Attended a tea party with Ryza and Klaudia.
Created the Reaper's Scythe.
Synthesized for the first time.
Visited the mainland for the first time.