Here is the full list of all 15 Alien 911 achievements.
Death on tutorial
Finish Purple planet perfectly with Insane Difficullty
Finish purple planet
Win online game
Win a map with full party (all different heroes)
Any friendlies didn't die on Insane
Don't spend any coins
Unlock Legendary skin
Complete map when all friendlies are miners
Unlock all possible props for all hero
Add 50 skill points for 1 stats
Mine all resources on the map
End any map on Insane difficulty without using props (any map online or single)
Get 25 kill streak
Win without using any special abilities