Here is the full list of all 30 ICEBOX: Speedgunner achievements.
Die 100 times
Acquire 1000000 total points
Access the secret “Making Of” area
Complete 10 levels with more than 90% health
Complete 10 Mixed Bag Games
Complete 25 levels on Expert
Complete a Short Marathon
Collects 100 Checkpoints
Complete a Long Marathon
Use Glitch 250 times
Collects 150 Health pickups
Defeat the Central AI
Complete 20 levels from Escape The Icebox
Explode 300 Red Crates
Destroy 150 Mines
Kill 1000 Sentients
Access 50 hidden panels
Destroy 50 Mine/Fire Launchers
Destroy 30 loot signs
Collect 500 weapons
Access 200 Terminals
Complete 3 levels with less than 10% health
Kill 300 enemies with headshots
Destroy 10 loot signs
Complete 3 levels within 3 sec of par time
Access 10 hidden panels
Collect 500 Technitium Pickups
Kill 50 enemies with a headshot
Complete the Tutorial
Start your first level