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