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