Almost all of the achievements in this section uses the same method.

• Not so fast

you'll get it whilist doing the achievements below.

• One shot, many kills

Buy chainsaw, stay in corner and wait for freeze gun sale (should be around day 5-7) and then continue staying in the corner while freezing the zombies near you. Once there's enough zombies (8) just use sniper. (remember to have around 25 freeze gun ammo)

• Precise cut

Same method as above, although it may take a few tries.

For the remaining achevements I would highly recommend checking out jirijanovotny's guide.

Endless night's achevements are 100% RNG so expect it to take a lot of tries in public lobbies.