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