Note: these cheats work only for the european version of the game.
Face Hugger Tip:
When you play as the facehugger in the first part of
the alien campign you have to get a person by themself
to get a host. Keep going until you reach the guy sleeping
in a chair. Don't waste your time listening to people talk
or waiting for one guy to leave. Just keep going until you
reach the guy sleeping in a chair.
More of a Strategy:
When fighting a tough character as the Predator (i.e.
the Queen), and are low on health and/or energy, use the
energy pistols secondary fire to stun them. This will give
you just enough time to heal yourself or use the energy sift.
Never use the pulse grenades in closed compartments or
near essential pickups (pickups are destructible).
If you are surrounded or trapped, use the burst fire.
Ignore all the Weyland-Yutani canisters strewn all over
the level. None of these contain anything of value.
Ignore searching for loot inside crates. There are no
Steam does not hurt. Smoking does...
Do not try to open doors that are locked.
There is no way you can open these.
Unlock all misions:
Go to your AvP directory and find the folder "Profiles", in the "Profiles" folder you will find a text ".txt" file with your player name/s.
Open your player text ".txt" file and scroll down till you find the caracter name such as "[Alien]", under each name you will see the the following:
"LevelStatus = (DWORD)284646098", now where the bunch off numbers are just replace them with the folowing numbers, each caracter has diferent numbers, so do like so: