| Back to sleep already? Animals are so lazy.
This achievement is rather difficult and very hard. Due to its hard difficulty, the number of power cells is higher than most achievements. Infinite Mode level achievements are not affected by this and they still keep their 50 power cell reward.
Unlimited Endurance is an in-game achievement in Run 3.
This achievement doesn't allow you to buy a respawn, but using a free respawn is fine. Any character is fine but the 3 suggested (and the Pastafarian) are the ones I would recommend if you are rich in power cells.