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