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