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