Here is the full list of all 51 JumpJet Rex achievements.
Die 500 times
Beat Ragequit Rex without losing any lives.
Complete adventure mode on normal.
Complete the RageQuit Rex mode
Spend 1,000,000 gold in the shop
Buy 20 different heads for Rex
Buy 30 different skin colors for Rex
Buy 30 different jet stream colors for Rex
Buy 20 pairs of jumpboots for Rex
Complete the SpeedRun mode and post a time to the leaderboard
Beat Speedrun Mode in under 90 minutes.
Complete adventure mode in co-op
Beat Adventure mode on normal, getting every star and hidden package, under 3 hours
Collect all the hidden items
Master all levels
Collect every coin in every level
Beat the target time for a level without using Dash, Drop or Rocket
Destroy 100 fireseeds in Jungle Jump
Destroy 25 snowballs in Snowblind without dying
Retry a level 30 times
Cover a level in ash
Use your projectile to trigger 75% of the switches in Power Core
Pay the ultimate price.
Get 3 stars on all 4 bosses
Kill the Big Globowski in under 30 seconds
Complete adventure mode on easy
Live to fly another day.
Defeat the fourth boss
Defeat the Yeti using only snow chunks
Get 3 stars on 30 levels
Defeat the third boss
Find Seedmours weak spot!
Beat a level in Co-op mode
Spend 100,000 gold in the shop
Get a 5x bounce combo on the first boss
Defeat the second boss
Use death to your advantage in Cold Front
Defeat the first boss
Destroy 100 robots
Use the shortcut for a photo finish in Scrollway
Have a 4x coin combo multiplier lasting over 30 seconds
Get a 100pt combo on Rex's target practice machine in the Dinonaut Base.
Beat P1ng in less than 10 seconds
Stun the patroller in p1ng 3 times in one run
Beat the target time for a level without using Jump
Master one level
With a 4x combo collect a ruby
Complete Boot Camp
Collect every coin in a level
Score 3 points in Holoball in the Rexercise Room
Play the game instead of letting it go extinct in your backlog