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20 G

There are 3 places to combine the items
1) Safe room
2) Next to Bigbuck hardwear
3) Next to Uncle Bills Dept store

The combos are

Spiked Bat - Baseball bat + Box of Nails
Drill Bucket - Drill + Bucket
I.E.D - Propane tank + Box of Nails
Molotov - Newspaper + Whiskey
Air Horn - Traffic Cone + Spray Paint
Beer Hat - Beer + Hard Hat
Boomstick - Shotgun + Pitchfork
Paddle Saw - Chain saw + Paddle
Electric Rake - Leaf Rake + Car Battery

Location of Items

Baseball Bat - Safe Room - Next to the work bench

Nails - Safe Room - Next to work bench on floor (More nails in the store part of the safe room behind the food)

Gas Can - Safe Room - Behind the broken car in the room with Katey

Spray Can - Roof of safe room- Head into the store part of the safe room use the door on the left in there is a ladder use that to get on roof spray can is on the vent thing.

Drill - Safe Area - Just before the save point in the safe area next to the building is the drill

Bucket - Safe Area - Just before the save point in the safe area next to the building on the floor

Whiskey - Safe Area - The moment you walk outside the room with Katey in on floor in front of you

Newspaper - Everywhere - I think theres always one by Bob on the roof ( to get to him jump on green bin jump to vent then onto floor)

Hard Hat - Roof across from Bills Dept store - Where you meet Bob and have to head to to get the water shed key just before the wooden bridge to the left is the hard hat

Beer - Bar (Next to safe house) - The beers are on the bar and behind it

Traffic Cone - Next to Uncle Bill's store- In the road cant miss it

Battery - Alley Behind Theater - Head towards the roadblock and take the alley on the left after the theater (Not the alley leading to the theater back door)

Paddle - A little outside the safe area - After exiting the safe area its on a ledge beside the first building on the right (Behind Dick the old man on the van)

Chainsaw - Bigbuck hardwear - On the shelf

Pitch fork - Bigbuck hardwear - On the shelf

Leaf Rake - Bigbuck hardwear - On the shelf

Shotgun - Bob's Fish n Hunt or Sheriff's office - On glass in bobs place or upstairs in sheriff's office

Tips/Notes:

To get this achievement you have to build all 9 combo items meaning you can't pick it up from Jed (Pitchfork Shotgun) or buy the item from the pawn shop (electric rake, Drill bucket). Also, this doesn't have to be all completed in one playthrough.