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