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