Here is the full list of all 75 ASSAULT GUNNERS HD EDITION achievements.
Clear mission 48
Clear mission 45
Clear mission with additional expansion parts
Clear mission 47
Clear mission 46
Clear mission 44
Clear mission 43
Clear mission 42
Clear mission 41
Destroy 10 enemies with 1 laser beam
Clear mission 40
Clear mission 39
Clear mission 38
Clear mission 37
Clear mission 36
Clear mission 35
Clear mission 34
Clear mission 33
Clear mission 32
Clear mission 31
Clear mission 30
Clear mission 29
Clear mission 28
Clear mission 27
Clear mission 26
Clear mission 25
Clear mission 24
Clear mission 23
Clear mission 22
Clear mission 21
Clear mission 20
Clear mission 19
Clear mission 18
Get 1 part to max LVL
Clear mission 17
Clear mission 16
Clear mission 15
Clear mission 14
Get 50 different parts
Clear mission 13
Clear mission 12
Clear mission 11
Clear mission 10
Clear mission 9
Clear mission 8
Clear mission 7
Clear mission 6
Clear mission 5
Clear mission 4
Raise part's level for first time
Clear mission 3
Clear mission 2
Get to LVL 2
Clear mission 1
Clear with all 3 Battle Mechs surviving
Replace parts
Display main menu
Clear a single player mission solo
Enter hidden room in mission 4
Defeat 3 enemies with 1 cannon/grenade
Destroy 100 enemies with each type of arms
Clear all additional missions on Hard or above
Play a mission with Lt. Colonel Hunter as the navigator
Play a mission with Major Vasquez as the navigator
Clear a mission with GR-NKL M3 only
Do a mission with only 4 additional weapons
Get all additional body and leg parts
Get all body and leg parts to LVL 10
Play a mission with 4 hover models
Clear mission 49
Clear mission 50
Reach pilot LVL 50
Play a mission with Sergeant Maillat as the navigator
Play a mission with Lieutenant Uhara as the navigator
Play the additional inferno map