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