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.
Became a Braver.
Obtained all recipes.
Got Ryza's battle level to 50.
Defeated the Queen of Shadows.
Obtained the Revelation Book.
Wrote a record of every exploration.
Completed requests to get Peter to interview you.
Found all treasure chests.
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.
Defeated the Queen of Darkness.
Entered the Kurken Bunker.
Activated everyone's Fatal Drive.
Defeated the Noble Paladin.
Found and installed all Power Reactors.
Visited the Holy Tower of Pynnor and learn the truth.
Defeated the Mirage Master.
Defeated the King of Storms.
Wrote a record of one exploration.
Created the Bomb Rod.
Defeated the Eternal Sculpture.
Installed the Multiplicauldron at the secret hideout.
Saved the goat you met on your travels.
Defeated the Savage Assassin.
Defeated the Shining Puni.
Helped Empel regain his former strength.
Spent the night camping in the Underworld.
Laid eyes on the Underworld.
Installed the Gathering Synthesizer at the secret hideout.
Learned about the history of Ryza and the others.
Found one treasure chest.
Helped create Rasen Pudding.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
Created the Bug Net.
Created the Hammer.
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.