Here is the full list of all 21 Mech Academy achievements.
Defeat your first Noxatum.
Sleep with Valentina.
Complete the Episode 1.
Hurt Drana
Sleep with Opal
Kiss Irina for the first time.
Kiss Lydia for the first time.
Complete the Episode 2.
Sleep with Sari.
Don't have sex with Elara when she is drunk.
Sleep with Elara.
Heal Irina's wounds.
Please Drana during meditation.
Win the game of three holes against Lydia's sister and father.
Sleep with Lydia.
Complete the Episode 3.
Eat out Irina in the newly fixed car.
Try noxatin for the first time.
Sleep with Drana.
Make out with Lydia in the pool
Kiss Elara after making her see reason.