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