Here is the full list of all 49 Atelier Ryza: Ever Darkness the Secret Hideout achievements.
Earned all trophies.
Obtained all recipes.
Became a Braver.
Defeated the Queen of Shadows.
Created an item with Item Level 99.
Created a bottle with Gathering Synthesizer Level 51.
Defeated all 5 Great Elements.
Got Ryza's alchemy level to 99.
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.
Found and installed all Power Reactors.
Defeated the Shining Puni.
Activated everyone's Fatal Drive.
Got Ryza's battle level to 50.
Defeated the Noble Paladin.
Defeated the Mirage Master.
Found all treasure chests.
Defeated the King of Storms.
Found one treasure chest.
Defeated the Eternal Sculpture.
Completed requests to get Peter to interview you.
Defeated the Savage Assassin.
Saved the goat you met on your travels.
Helped create Rasen Pudding.
Wrote a record of one exploration.
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.
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.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
Created the Hammer.
Created the Fishing Rod.
Built a secret hideout for everyone.
Attended a tea party with Ryza and Klaudia.
Witnessed the rise of a strange beast.
Created the Woodcutter's Axe.
Created the Reaper's Scythe.
Synthesized for the first time.
Visited the mainland for the first time.