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