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