Thanks to Jujii8, Oriole2682, and vT AxE for sticking through it and figuring out the ins and out.
Alright, figured i'd write a clearer guide cause we coulden't get this to work at all, and finally figured it out. I've seperated the guide into steps. Read the ENTIRE step before progressing as ill have Notes at the bottom if there's important info.
Step 1: You NEED 4 people for this. Tommy will only spawn once 2 are dead, thus you need a 3rd Councellor and Jason around.
Step 2: Do this in Private Matches. Get all 4 people together and you should stack up this way:
1 Person playing as Jason 5 (low stun resistance and defense)
1 Male Councellor
1 Female Councellor
+1 Councellor (doesen't matter who)
Also, pick Packanack Small as your map (this is a preference and easy to use map). Start the Match.
Step 3: Jason starts with a map right away. By hitting
, you can not only see where his mothers Hut is, but a blue lightning bolt can be the radio to summon Tommy Jarvis.
Female Councellor: Have the female councellor make a break directly to Jason's cabin/mother's hut. If you are struggling with locations, you can find maps in drawers, or, in front of Packanack Lodge is a park map, and you can grab a map from the box on the right of this board. Once there, she should take Pamela's Sweater. If you've never done this you'll pop an achievement. ONLY FEMALE COUNCELLORS CAN DO THIS STEP. Once retrieved, head back to Packanack Lodge and keep out of sight from Jason, otherwise the screen will darken as you are being affected by "fear" and will no longer be able to perform certain actions. DO NOT USE
AT ALL UNTIL THIS GUIDE TELLS YOU TO. If you use it near Jason you will use up the sweater and have to reset the lobby to a new match to try again.
Jason can now teleport to the Fire at Packanack Lodge (the outside sitting area where Jason kills a man in the fire during the opening cutscene). Jason can use the teleport ability by using
+
. This will have a minor recharge time.
Councellor 2: Have one of the other councellors go to the blue lightning bolts Jason see's on the map, and try to find a building with a large red and white radio tower behind it. Inside will be a black large radio. Have them wait here. DO NOT INTERACT WITH THE RADIO JUST YET.
Councellor 3: Have the 3rd councellor scouring for weapons in the buildings. Once you find a baseball bat, head to the fire, and drop the bat next to the fire by HOLDING
on the D-Pad. Find a machete and do the same, dropping it right next to it.
Step 4: Remove Jason's Mask. You DO NOT have to have it in your inventory or anything, but he does have to be maskless for the kill to happen. Essentially, without touching the Bat and Machete you previously obtained, go gather any other weapons (even sweater girl can help) and just keep swinging at Jason, eventually you will do enough damage his mask comes off.
NOTE - Jason going into RAGE Mode doesen't matter for this achievement or his damage state. DO NOT under any circumstance hit Y as the Female Councellor. You will void the achievement and have to reset the lobby as you'll use the sweater up.
Step 5: Female councellor hides again to keep from being "afraid". Jason then kills the other councellor (fastest way is to grab with
and go over to a picnic table by the fire and hit
). The councellor by the radio HOLDS the
button, which will put out a call for Tommy Jarvis to show up. He then runs towards the fire at Packanack Lodge (or if Jason knows the building can teleport to him) and is also killed by Jason.
Step 6: Now one of the two dead councellors will spawn as Tommy Jarvis. You CANNOT force one to spawn. It's 50/50 and it does not matter who dies in what order or who calls. We've tested this thoroughly. Even if the same guy is Tommy 10x in a row it's just pure RNG.
As Tommy Jarvis, fire the shotgun immediately to get rid of it. You can also drop it but eitherway. From there make your way to the fire at Packanack Lodge. Tommy will also spawn with a map, use
if you're unfamiliar still with the map.
Step 7:Alright, this needs to be done in a very specific way...
READ THE WHOLE STEPTommy needs to pick up the bat that was dropped, and position himself so that he can pick up the Machete immediately after he swings his weapon. Once he's ready, have Jason put his back to Tommy, but leave room so Tommy can run around him to his front.
When you're ready, have the female councellor with the sweater come out of hiding, and as she slowly approaches the two, keep hitting
. The reason for this is that we tried for hours to get this to work, but we were trying point blank. You can have a bit of distance between Jason and her and the sweater will still work. The sweater WILL NOT ACTIVATE unless you're close enough to Jason so don't be scared you'll use it and it not work. If you're too close the stun happens way too quickly and ends immediately.
As soon as she uses the sweater, you'll hear Jason's mom talking and he'll start reacting, almost like he's gonna swing his weapon and starts hesitating. IMMEDIATELY as Tommy Jarvis, swing the bat at him when this starts. He should drop to his knees. Grab the machete quickly, and run to the front of him and you should get a prompt to hit
. A cutscene should start and boom. Achievement.
IMPORTANT NOTE: You don't have much time to do the swing with the bat, grab the machete and run around... Maybe about 8-10 seconds. So don't keep swinging. It SHOULD only take 1 swing from behind to trigger this. Very rarily it took two, but don't spam your RT swing.