Here is the full list of all 14 Neon Chrome achievements.
Complete all special levels.
Upgrade a stat to level 100.
Unlock all unlockables.
Kill 3 enemies with a single railgun bullet.
Finish a normal level without being seen.
Finish a normal level in under 20 seconds.
Finish a normal level without using abilities, weapons or melee.
Stop the Overseer 1.0.
Play 20 levels without dying.
Defeat the hovertank.
Defeat the centipede.
Kill 8 enemies with a single explosive.
Kill 1000 enemies.
Defeat the spiderbot.