Here is the full list of all 19 Acting Lessons achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
You spared Peter's life
Unlocked all gallery scenes
Chose Ana's path
Its fleece was white as snow
You finished Peter
Chose Megan's path
100!
Chose Rena as a partner
A new beginning for Liam
Completed Episode 8
Chose Melissa's path
You are a matchmaker
Completed Episode 7
Completed Episode 6
Completed Episode 5
Completed Episode 4
Completed Episode 3
Completed Episode 2
Completed Episode 1