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