Here is the full list of all 37 Breakneck achievements.
Travel 1,000,000km in total
Spend 120s in the air
Collect 50 Pick-ups
Boost for 120s in total
Race in 3 different types of weather
Collect 1,000 Coins
Travel 100,000m in one run
Finish in at least prize tier 6
Finish in at least prize tier 3
Finish in prize tier 1
Travel 100,000km in total
Travel 50,000m in one run
Travel 10,000km in total
Collect 10,000 Coins
Collect 100,000 Coins
Collect 500 Pick-ups
Collect 5,000 Pick-ups
Travel 200,000m in one run
Spend 600s in the air
Spend 6,000s in the air
Boost for 600s in total
Boost for 6,000s in total
Upgrade 1 Pick-up to max level
Upgrade 4 Pick-ups to max level
Unlock all Pick-ups
Unlock all Perks
Try 5 unique Perk combinations
Try 10 unique Perk combinations
Try 50 unique Perk combinations
Reach pilot level 5
Reach pilot level 10
Reach pilot level 20
Play for 3 days in a row
Play for 7 days in a row
Play for 14 days in a row
Race in 5 different types of weather
Race in 6 different types of weather