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.
Got Ryza's alchemy level to 99.
Defeated the Queen of Shadows.
Created a bottle with Gathering Synthesizer Level 51.
Defeated all 5 Great Elements.
Became a Braver.
Obtained all recipes.
Obtained the Revelation Book.
Found all treasure chests.
Completed requests to get Peter to interview you.
Defeated the Eternal Sculpture.
Defeated the Savage Assassin.
Saw everyone move on to chase their dreams.
Created the Crimson Stone and saved Kurken Island.
Wrote a record of every exploration.
Defeated the Queen of Darkness.
Got Ryza's battle level to 50.
Activated everyone's Fatal Drive.
Found and installed all Power Reactors.
Created the Bomb Rod.
Defeated the Shining Puni.
Entered the Kurken Bunker.
Saved the goat you met on your travels.
Visited the Holy Tower of Pynnor and learn the truth.
Defeated the King of Storms.
Defeated the Noble Paladin.
Defeated the Mirage Master.
Installed the Multiplicauldron at the secret hideout.
Helped Empel regain his former strength.
Helped create Rasen Pudding.
Spent the night camping in the Underworld.
Laid eyes on the Underworld.
Installed the Gathering Synthesizer at the secret hideout.
Wrote a record of one exploration.
Learned about the history of Ryza and the others.
Created the Bug Net.
Installed a Power Reactor at the secret hideout.
Created the Fishing Rod.
Created the Hammer.
Defeated the dragon at the old castle.
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.