Here is the full list of all 49 Atelier Ryza: Ever Darkness the Secret Hideout achievements.
Earned all trophies.
Obtained all recipes.
Activated everyone's Fatal Drive.
Defeated the Queen of Shadows.
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.
Defeated all 5 Great Elements.
Saw everyone move on to chase their dreams.
Wrote a record of every exploration.
Created the Crimson Stone and saved Kurken Island.
Defeated the Queen of Darkness.
Entered the Kurken Bunker.
Defeated the Eternal Sculpture.
Got Ryza's battle level to 50.
Defeated the Mirage Master.
Defeated the Noble Paladin.
Found and installed all Power Reactors.
Found all treasure chests.
Visited the Holy Tower of Pynnor and learn the truth.
Obtained the Revelation Book.
Completed requests to get Peter to interview you.
Saved the goat you met on your travels.
Defeated the King of Storms.
Created the Bomb Rod.
Installed the Multiplicauldron at the secret hideout.
Defeated the Savage Assassin.
Defeated the Shining Puni.
Helped Empel regain his former strength.
Wrote a record of one exploration.
Spent the night camping in the Underworld.
Laid eyes on the Underworld.
Installed the Gathering Synthesizer at the secret hideout.
Learned about the history of Ryza and the others.
Helped create Rasen Pudding.
Found one treasure chest.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
Created the Bug Net.
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.