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