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