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.
Obtained all recipes.
Defeated the Queen of Shadows.
Became a Braver.
Created a bottle with Gathering Synthesizer Level 51.
Defeated all 5 Great Elements.
Obtained the Revelation Book.
Wrote a record of every exploration.
Completed requests to get Peter to interview you.
Found all treasure chests.
Found and installed all Power Reactors.
Got Ryza's battle level to 50.
Defeated the King of Storms.
Defeated the Savage Assassin.
Defeated the Noble Paladin.
Defeated the Mirage Master.
Defeated the Eternal Sculpture.
Activated everyone's Fatal Drive.
Saved the goat you met on your travels.
Helped create Rasen Pudding.
Found one treasure chest.
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.
Wrote a record of one exploration.
Defeated the Shining Puni.
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.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
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.