Full list of all 21 Time Carnage achievements worth 1,000 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox One.
Shoot 250,000 bullets.
Achieve Gold in all challenges.
Achieve Silver in all challenges.
Complete the story on "Hard" difficulty.
Complete the story on "Normal" difficulty.
Take no damage for an entire level in the story mode.
Survive 25 waves in Arcade
Kill 1000 Dinosaurs.
Kill 1000 Skelton Army.
Unlock all the perks.
Unlock all the weapons.
Achieve Bronze in all challenges.
Played all modes
Kill 1000 Robots.
Kill 1000 Zombies.
Complete 4th Century BC on story
Complete the story on "Easy" difficulty.
Complete 6th Millennium on story
Complete Mesozoic Era on story
Get 500 Headshots.
Complete 4th Millennium on story