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