Here is the full list of all 17 MOBILE SUIT GUNDAM BATTLE OPERATION 2 Playtest achievements.
Get promoted to Private First Class.
Sortie into battle 10 times.
Defeat a rival.
Complete "Exploring the base camp" training.
Acquire 10 MS.
Get promoted to Lance Corporal.
Get promoted to Corporal.
Get promoted to Sergeant.
Get promoted to Master Sergeant.
Rank up to Rating D.
Rank up to D+ Rating.
Rank up to Rating C-.
Rank up to Rating C.
Rank up to C+ Rating.
Rank up to Rating B-.
Rank up to Rating B.
Rank up to B+ Rating.