Here is the full list of all 18 Not Dead Yet achievements.
Play with someone else.
Survive for 10 minutes in a single match.
Die for the first time.
Revive a teammate for the very first time.
Kill 100 zombies in a single match.
Kill your very first zombie.
Be revived by a teammate.
Survive for 20 minutes in a single match.
Kill 250 zombies in a single match.
Kill 500 zombies in a single match.
Kill 1,000 zombies in a single match.
Get rescued for the very first time.
Get a Perk for the very first time.
Get 20 Perks in a single match.
Win a match without any Perks.
Get to the Mefisto Pit for the very first time.
Kill Mefisto for the very first time.