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