Full list of all 15 Pixel Gladiator achievements worth 2,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements in the base game.
The base game contains 10 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 5 achievements worth 1,000 Gamerscore.
Final step to the pantheon
Become a star!
Show yourself to everyone!
...
"I don't care if you are ten metres high. I will kill you anyway!"
Every weapon is important!
Defense should be the best!
"Cool guys don't look at explosion."
"Huge robots are the best."
...just business.
Get jetpack upgrade
Fail to protect the base
Kill 30 enemies
Kill 20 enemies
Kill 10 enemies