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