Here is the full list of all 14 Dustoff Heli Rescue achievements.
Spin with the Scout twice at the same time
Spin with a full Scout
Survive hitting a tree
Save Rambo
Find Buddha
Earn golden medal on every mission
Earn at least silver medal on every mission
Complete every mission
Save 50 soldiers
Save 100 soldiers
Save 200 soldiers
Die within the first 4 seconds.
Complete the last mission with the M60 gun
Pick up 20 soldiers without landing