Here is the full list of all 97 Too Many Weapons achievements.
Kill someone with a bench press
Kill someone with a folding table
Kill someone with a red surfboard
Kill someone with a cake
Kill someone with a gigantic fuel tank
Kill someone with a rocket engine
Kill someone with a swing
Kill someone with a lamp post
Kill someone with a cinder block
Kill someone with a box of oranges
Kill someone with a treadmill
Kill someone with a park bench
Kill someone with a park bin
Kill someone with a merry-go-round
Kill someone with a ladder
Kill someone with a drill
Kill someone with a cone
Kill someone with a saw
Kill someone with a giant bell
Kill someone with a giant bone
Kill someone with a giant teapot
Kill someone with a box of milk cartons
Kill someone with a box of apples
Kill someone with a box of large sodas
Kill someone with a yellow surfboard
Kill someone with a coconut
Kill someone with a blue surfboard
Kill someone with a watermelon
Kill someone with a satellite dish
Kill someone with a PC
Kill someone with a museum cordon pole
Kill someone with a giant vase
Kill someone with a sledgehammer
Kill someone with a playhouse
Kill someone with a pallet
Kill someone with a rake
Kill someone with a scarecrow
Kill someone with a box of bananas
Kill someone with a box of meat
Kill someone with a shopping basket
Kill someone with a mailbox
Kill someone with an office recycling bin
Kill someone with a water cooler
Kill someone with a filing cabinet
Kill someone with a lifebuoy
Kill someone with an oar
Kill someone with a rubber dinghy
Kill someone with a swivel chair
Kill someone with a blueboard
Kill someone with a green car
Kill someone with a white car
Kill someone with a street sign post
Kill someone with a red car
Kill someone with a traffic light
Kill someone with a fence
Kill someone with a blue car
Kill someone with an antenna
Kill someone with a fire extinguisher
Kill someone with a kettlebell
Kill someone with an exercise bike
Kill someone with a weight plate
Kill someone with a barbell
Kill someone with a shovel
Kill someone with a tractor
Kill someone with a hay bale
Kill someone with a cart
Kill someone with a bag of cement
Kill someone with a wooden barrier
Kill someone with a wheelbarrow
Kill someone with a bucket
Kill someone with a beachball
Kill someone with a green surfboard
Kill someone with a parasol
Kill someone with a library chair
Kill someone with a bookshelf
Kill someone with an office desk
Kill someone with a printer
Kill someone with an armchair
Kill someone with a tire
Kill someone with a spring rider
Kill someone with a seesaw
Kill someone with an operating table
Kill someone with a blue equipment trolley
Kill someone with a double-monitor hospital machine
Kill someone with a grey operating trolley
Kill someone with an X-ray machine
Kill someone with an operating room stool
Kill someone with a flowerpot
Kill someone with a table and cloth
Kill someone with a chair from a round table
Kill someone with a giant stereo
Kill someone with a meteorite fragment
Kill someone with a black museum exhibit block
Kill someone with a school chair
Kill someone with a school desk
Kill someone with a box of paper towels
Kill someone with a shopping trolley