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