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