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