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