Here is the full list of all 49 Atelier Ryza: Ever Darkness the Secret Hideout achievements.
Earned all trophies.
Obtained all recipes.
Obtained the Revelation Book.
Completed requests to get Peter to interview you.
Found all treasure chests.
Created an item with Item Level 99.
Created a bottle with Gathering Synthesizer Level 51.
Defeated all 5 Great Elements.
Got Ryza's alchemy level to 99.
Defeated the Queen of Shadows.
Got Ryza's battle level to 50.
Became a Braver.
Wrote a record of every exploration.
Helped create Rasen Pudding.
Saved the goat you met on your travels.
Defeated the Eternal Sculpture.
Activated everyone's Fatal Drive.
Wrote a record of one exploration.
Defeated the King of Storms.
Defeated the Mirage Master.
Found and installed all Power Reactors.
Saw everyone move on to chase their dreams.
Created the Crimson Stone and saved Kurken Island.
Defeated the Queen of Darkness.
Entered the Kurken Bunker.
Found one treasure chest.
Visited the Holy Tower of Pynnor and learn the truth.
Defeated the Noble Paladin.
Created the Bomb Rod.
Installed the Multiplicauldron at the secret hideout.
Defeated the Savage Assassin.
Defeated the Shining Puni.
Helped Empel regain his former strength.
Created the Bug Net.
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.
Created the Fishing Rod.
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.