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