I tried to put them in order. This was the best I could do.
Predator: Concrete Jungle
Predator: Big Game
Predator: Cold War
Predator: Turnabout
Predator: South China Sea
Aliens: Steel Egg
Aliens: Earth Hive
Aliens vs. Predator: Prey****
Aliens: Nightmare Asylum
Aliens: The Female War
Aliens: Genocide
Aliens: Alien Harvest
Aliens: Labyrinth
Aliens: Rogue
Aliens: Music Of The Spears
Aliens: Berserker
Aliens vs. Predator: War
Aliens vs. Predator: Hunter's Planet
Aliens: DNA War
Predator: Forever Midnight
Aliens: Cauldron
Predator: Flesh And Blood
Aliens: Criminal Enterprise
Aliens: No Exit
Aliens: Original Sin
Aliens vs. Predator: Prey is kind of iffy. In it, they say that the xenomorphs are a species never encountered before. I would say that would place it about the same time as Earth Hive. However, I haven't read all of those, and apparently there's a "grand eraser" or something that erases all documented knowledge of the xenomorphs and naturally over 50 or so years, there's a new generation that's never heard of xenomorphs.
Also, AvP: War & AvP: Hunter's Planet are another thing that's iffy. Hunter's Planet came out before War, but War is seemingly placed before it. In all actuality, they're both written as sequels to Prey. They can sort of work in the order of Prey, War, & Hunter's Planet, but the only problem is a character named Shorty. However, you can just tell yourself it's a new character also named Shorty.