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 the Eternal Sculpture.
Defeated the Savage Assassin.
Obtained all recipes.
Became a Braver.
Got Ryza's battle level to 50.
Created a bottle with Gathering Synthesizer Level 51.
Created an item with Item Level 99.
Obtained the Revelation Book.
Found all treasure chests.
Defeated all 5 Great Elements.
Wrote a record of every exploration.
Found and installed all Power Reactors.
Completed requests to get Peter to interview you.
Got Ryza's alchemy level to 99.
Defeated the Noble Paladin.
Defeated the Mirage Master.
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.
Activated everyone's Fatal Drive.
Found one treasure chest.
Defeated the Shining Puni.
Helped create Rasen Pudding.
Saved the goat you met on your travels.
Wrote a record of one exploration.
Entered the Kurken Bunker.
Created the Bomb Rod.
Visited the Holy Tower of Pynnor and learn the truth.
Installed the Multiplicauldron at the secret hideout.
Created the Bug Net.
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.
Defeated the dragon at the old castle.
Installed a Power Reactor at the secret hideout.
Created the Hammer.
Created the Fishing Rod.
Created the Woodcutter's Axe.
Built a secret hideout for everyone.
Witnessed the rise of a strange beast.
Attended a tea party with Ryza and Klaudia.
Created the Reaper's Scythe.
Synthesized for the first time.
Visited the mainland for the first time.