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