Here is the full list of all 13 Ski Sniper achievements.
100% objectives complete
Collect all weapons
Earn 1 000 000 $
Shoot down 10 chairs from chair lift
Earn 500 000 $
Jumper body reaches 180m distance
Earn 100 000 $
Hit Brain
Hit Liver
Jumper body reaches 160m distance
Hit Heart
Jumper body reaches 140m distance
First jumper hit