Here is the full list of all 14 Clea achievements.
The base game contains 13 achievements, and there is 1 DLC pack containing 1 achievements.
Unlocked a bronze, silver or gold reward.
Completed chapter 1 on Chaos Mode.
Completed chapter 1 in under 3 minutes.
Completed chapter 1 on Arcade Mode.
Reached the good (incomplete) ending.
Reached the bad ending.
Reached the good (complete) ending.
Completed chapter 6.
Completed chapter 5.
Completed chapter 4.
Completed chapter 3.
Completed chapter 2.
Completed chapter 1.
Completed chapter 1 in War Maiden Mode.