Here is the full list of all 50 Heliborne achievements.
Lose a night map battle
Completely research all USSR helicopters of all generations
Fully research all 4th generation Russian helicopters and their variants
Earn "Sniper" award 50 times
Completely research all Mi-24 helicopters and their variants
Earn all game awards at least one time each
Research all variants of the KA-60 helicopter
Win a battle with a custom squadron consisting of only Mi-28 and Mi-28N
Shoot an enemy helicopter down using MH-6
Win a battle with a custom squadron consisting of only Mi-8 variants
Win a battle with a custom squadron consisting of only Ka-50 and Ka-52
Win a night map battle using custom squadron with only KA-50
Shoot an enemy helicopter down using Ka-226
Win a battle with a custom squadron consisting only of three Kamov line helicopters with coaxial rotors
Earn "Air combat master 1st class" award
Research all 1st and 2nd generation Soviet helicopters
Fully research all variants of 1st and 2nd generation USA helicopters
Completely research all AH-1 helicopters and their variants
Earn awards: "Manpad hunter", "RPG hunter" and "Mortar hunter"
Earn "Mortar hunter" award
Fully research all variants of 1st and 2nd generation US helicopters
Win a solo Co-Op battle on Hard difficulty
Win a battle with a custom squadron consisting of only AH-64D and OH-58D
Win a battle with a custom squadron consisting of only AH-64A and AH-64D
Win a Co-Op battle on 4th generation map set to Very Hard difficulty
Win a night map battle
Earn "Manpad hunter" award
Shoot an AH-64A down using Mi-2
Bring back and turn in for repairs helicopter with at least 3 destroyed modules
Shoot an enemy down using H-21
Shoot an enemy down using door gunners of the H-34
Shoot an enemy down using Mi-1
Deploy all troops from a Yak-24 during a single sortie
Get grounded having all 3 helicopters in your squadron under repair
Deploy 8 MANPADs within 70 meter radius
Win a battle with a three helicopter squadron customized from the OH line: OH-6, MH-6, MD-500, AH-6
Deploy all soldiers from ACH-47 during one sortie
Have your UH-60A shot down while playing the Afghanistan, Khost province map
Deploy all troops from an HH-53 during a single sortie
Have teammates destroy 50 targets with your mortars during single match
During a single sortie, exhaust all ammunition of an attack helicopter
Earn a post-battle cosmetic item reward
Research all 1st and 2nd generation US helicopters
Destroy 50 enemy vehicles during one battle
Win a battle using a custom squadron consisting of only recon helicopters
Deploy all soldiers from UH-1D during a landing
Avoid a MANPAD launch or an air-to-air missile
Pick up at least one previously deployed trooper
Research your first helicopter
Win a Co-Op battle