More easy guides here to get 100% here

Controls

W = Up
A = Left
S = Down
D = Right
E = Throw Lantern
F = Change weapon
Left mouse click = attack / shoot

All the following achievements (image 3 below) are gotten by following these steps.

1) Press Start
2) select host server (image 1 below)
3) select the maps 1 by one (image 2 below).

You need a friend. If you have none add me (tell me which game you are adding me for and I'll help you).

Lobby Achievement

One person host a server the other person just press start and join the active server (you'll see 1 player top of screen just click to join). Tell your friend (who's hosting the server) you have pressed join and they need to press escape then select lobby server only. Wait for the timer it will pop.

One person host a server the other person just press start and join the active server press F for knife then stab the other person 9 times at the end of the match the achievements will pop (image 2 below)