Here is the full list of all 18 Aim Trainer - there are Shooting Range achievements.
Complete level 5
Complete level 15
Complete level 30
Complete level 40
Complete level 45
Shoot all targets in trap shooting mode
Shoot all targets in skeet shooting mode
Reach stage 5 in hunting mode
Reach stage 8 in hunting mode
Reach stage 10 in hunting mode
Acquire 3 different pistols
Acquire 5 different pistols
Acquire 3 different shotguns
Acquire 5 different shotguns
Acquire 3 different sniper riffles
Acquire 5 different sniper riffles
Upgrade any weapon once
Upgrade a weapon to max level