Here is the full list of all 30 The Legend of Korra achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Completed the highest difficulty of Pro-bending.
Completed all tutorials.
Completed the game on Extreme difficulty.
Won a Face-Off in a Pro-bending match.
Countered 100 times.
Collected every treasure item.
Performed 100 Finishing Moves.
Completed a Naga Running sequence without hitting anything.
Got 10 Knockouts in Pro-bending matches.
Went into Avatar State 10 times.
Obtained all combos.
Collected 10 cabbages.
Spirit-bended 200 dark spirits.
Maxed out all bending types.
Purchased 12 talismans.
Completed Chapter 8.
Completed Chapter 7.
Completed Chapter 6.
Completed Chapter 5.
Dodged 100 times.
Completed Chapter 4.
Went into Clash Mode 10 times.
Jumped 100 times.
Used your first equipped item.
Completed Chapter 3.
Entered the Collection Screen for the first time after finding a treasure.
Equip your first item in Korra's Room.
Bought your first item at the shop.
Completed Chapter 2.
Completed Chapter 1.