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.
Got Ryza's alchemy level to 99.
Obtained all recipes.
Became a Braver.
Defeated the Eternal Sculpture.
Defeated the Savage Assassin.
Created a bottle with Gathering Synthesizer Level 51.
Wrote a record of every exploration.
Wrote a record of one exploration.
Defeated all 5 Great Elements.
Activated everyone's Fatal Drive.
Got Ryza's battle level to 50.
Defeated the Queen of Shadows.
Obtained the Revelation Book.
Saw everyone move on to chase their dreams.
Created the Crimson Stone and saved Kurken Island.
Completed requests to get Peter to interview you.
Defeated the Queen of Darkness.
Found all treasure chests.
Found and installed all Power Reactors.
Defeated the King of Storms.
Defeated the Mirage Master.
Entered the Kurken Bunker.
Defeated the Noble Paladin.
Visited the Holy Tower of Pynnor and learn the truth.
Created the Bomb Rod.
Installed the Multiplicauldron at the secret hideout.
Helped create Rasen Pudding.
Saved the goat you met on your travels.
Helped Empel regain his former strength.
Defeated the Shining Puni.
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.
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.
Attended a tea party with Ryza and Klaudia.
Witnessed the rise of a strange beast.
Created the Woodcutter's Axe.
Created the Reaper's Scythe.
Synthesized for the first time.
Visited the mainland for the first time.