Here is the full list of all 49 Atelier Ryza: Ever Darkness the Secret Hideout achievements.
Earned all trophies.
Defeated the Queen of Shadows.
Created a bottle with Gathering Synthesizer Level 51.
Activated everyone's Fatal Drive.
Created an item with Item Level 99.
Got Ryza's alchemy level to 99.
Obtained all recipes.
Obtained the Revelation Book.
Defeated the Eternal Sculpture.
Defeated all 5 Great Elements.
Got Ryza's battle level to 50.
Became a Braver.
Completed requests to get Peter to interview you.
Defeated the Savage Assassin.
Defeated the Mirage Master.
Wrote a record of every exploration.
Found all treasure chests.
Defeated the Noble Paladin.
Defeated the Shining Puni.
Saw everyone move on to chase their dreams.
Created the Crimson Stone and saved Kurken Island.
Defeated the King of Storms.
Defeated the Queen of Darkness.
Found and installed all Power Reactors.
Saved the goat you met on your travels.
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.
Helped create Rasen Pudding.
Spent the night camping in the Underworld.
Installed the Gathering Synthesizer at the secret hideout.
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.
Found one treasure chest.
Created the Hammer.
Created the Fishing Rod.
Wrote a record of one exploration.
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.