If you managed to ride a Survivor for 12 seconds, you’ll have no doubt incapacitated him, leaving you free to try and ride another survivor. The ‘BACK IN THE SADDLE’ achievement requires luck more than anything. You can always get these online by trying to pick off a lone Survivor for the ‘QUALIFIED RIDE’ achievement and hoping that the Survivor’s teammates don’t come to his rescue once you’ve jumped him. The next 2 achievements are Jockey related and can be achieved at the same time.
#Into the dead 2 is it online multiplayer Patch
Once you’ve spawned as the Spitter, aim for the second controllers Survivor and the acid patch should hit all 4 Survivors, earning you the ‘GREAT EXPECTORATIONS’ achievement. The AI will always stick with the human player, so hitting all 4 is simple. Load up a private Versus match on any campaign with your main profile as the Infected and the second controller as the Survivors. This can be very easily boosted with a second controller, however. The finale stage is the best time to attempt this as the Survivors will be camping somewhere. Wait until all 4 of the Survivors are grouped together. Be patient with this one if you’re playing online. Whilst playing as the Spitter, you’ll need to try and hit all 4 Survivors with an acid patch. The majority of the achievements can be boosted with a second controller, but it’s far more fun to try and earn them whilst playing online. Left 4 Dead 2 builds on the multiplayer experience from its predecessor with more modes, weapons and Special Infected.