Here is the full list of all 16 Space Armor 2 achievements.
Die！
HP is less than 10%
Pass the chapter 1
Perfect clearance 3 times
Strengthen any weapon 2 times
Kill any boss 1 times
Complete endless mode 3 times
Complete challenge mode 1 times
Character upgrade to level 3
Promoted to corporal
Promoted to sergeant
Promoted to staff sergeant
Strengthen weapons to level 3
With 2 weapons
Will strengthen the armor to level 3
The transformation to the excellent quality of armor