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