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