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 a bottle with Gathering Synthesizer Level 51.
Became a Braver.
Defeated the Queen of Shadows.
Found all treasure chests.
Defeated all 5 Great Elements.
Defeated the Mirage Master.
Created an item with Item Level 99.
Wrote a record of every exploration.
Saved the goat you met on your travels.
Activated everyone's Fatal Drive.
Wrote a record of one exploration.
Saw everyone move on to chase their dreams.
Got Ryza's alchemy level to 99.
Created the Crimson Stone and saved Kurken Island.
Found and installed all Power Reactors.
Defeated the Eternal Sculpture.
Found one treasure chest.
Defeated the Queen of Darkness.
Entered the Kurken Bunker.
Defeated the King of Storms.
Defeated the Savage Assassin.
Got Ryza's battle level to 50.
Defeated the Shining Puni.
Helped create Rasen Pudding.
Created the Bomb Rod.
Visited the Holy Tower of Pynnor and learn the truth.
Defeated the Noble Paladin.
Installed the Multiplicauldron at the secret hideout.
Helped Empel regain his former strength.
Spent the night camping in the Underworld.
Installed the Gathering Synthesizer at the secret hideout.
Laid eyes on the Underworld.
Learned about the history of Ryza and the others.
Created the Bug Net.
Installed a Power Reactor at the secret hideout.
Created the Hammer.
Defeated the dragon at the old castle.
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.