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