Here all the items you can use. There are 2 important things to know:
1. All items have only 1 use
2. Not all Contraptions have a 1-time use

ITEMS: Rope + Tree Branch
INTERACTION: Hang off the branch
USAGE: Once
ACHIEVEMENT: Just Hanging!

ITEMS: Poison + Picnic Table
INTERACTION: Drink poison at the table
USAGE: Infinite
ACHIEVEMENT: Sweet taste of death!

ITEMS: Tree Branch + Tree w/ Beehive
INTERACTION: Use the stick to make the bees turn hostile towards you
USAGE: Infinite
ACHIEVEMENT: Bee Gees!

ITEMS: Fork + Electricity Machine
INTERACTION: Electrocute yourself using the fork and machine
USAGE: Infinite
ACHIEVEMENT: Electrifying!

ITEMS: Scissors + Tree w/ Anchor
INTERACTION: Cut the rope holding the anchor
USAGE: Once
ACHIEVEMENT: Anvil!

ITEMS: Lighter Match + Gas Can
INTERACTION: Light a match on the gas trail
USAGE: Once
ACHIEVEMENT: Light my fire!

ITEM: Buzzsaw
USAGE: Once
ACHIEVEMENT: Saw!

ITEM: Campfire (Temporarily stops Life Regen)
USAGE: Once
ACHIEVEMENT: Camping!

You will either get:


ITEM: 'X' Mark (You get crushed with a Piano or Crippling Depression)
USAGE: Once
ACHIEVEMENT: Piano!

OR


ITEM: 'X' Mark (You get crushed with a Piano or Crippling Depression)
USAGE: Once
ACHIEVEMENT: Crippling!

ITEM: Spikes
USAGE: Once
ACHIEVEMENT: Spikes!