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.
Defeated all 5 Great Elements.
Obtained the Revelation Book.
Got Ryza's alchemy level to 99.
Completed requests to get Peter to interview you.
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.
Activated everyone's Fatal Drive.
Got Ryza's battle level to 50.
Found and installed all Power Reactors.
Entered the Kurken Bunker.
Found all treasure chests.
Created the Bomb Rod.
Visited the Holy Tower of Pynnor and learn the truth.
Defeated the Noble Paladin.
Defeated the Mirage Master.
Defeated the Eternal Sculpture.
Installed the Multiplicauldron at the secret hideout.
Saved the goat you met on your travels.
Defeated the King of Storms.
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.
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.
Created the Hammer.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
Created the Fishing Rod.
Found one treasure chest.
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.