Here is the full list of all 27 Shieldmaiden: Remix Edition achievements.
Complete Dome of the Cataclysm
Complete Escape from the Dome
Complete Mt. Runa - The Edge of the Dome
Complete Mt. Runa - Hospital
Find the Stuffed Bear
Complete Downtown - Scrapyard District
Find the Glasses
Complete Downtown - Commercial District
Find the Telescope
Complete Warden's Sanctuary - Historical Area
Find the Book
Complete Warden's Sanctuary - Promenade
Don't let the Wardenash create a lotus on the ground
Find the Newspaper
Find the Sprout
Pet the dog
Complete Modigard Main Terminal
Make de Shield hover around Asta for 10 seconds
Defend from a projectile during the wall slide
Kill 5 enemies in a single Special Atack
Kill the Passing Onslaught (the flying enemy inside the Cataclism)
Find the Ribbon
Find the Poster
Find the Microphone
Find the Frame
Find the Police Cap
Find the Globe