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