There are various structures in the game, walls, doors, doorways, stairs, ramps, ceilings, pillars, foundations that can be made out of wood or metal.

What can I break with my hatchet/pickaxe and how long does it take?

What can I blow up with grenades or c4 and how many does it take?

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2 Answers

This is an accurate list of things you can destroy and the effort you need. I didn't tried personally to destroy all the things listed, but many that I tried confirm those numbers.

Pratically is important to remember that you can destroy all except pillars, ceilings and foundations.

Credits to user Juper0 / Source

Wood

Wood Shelter: 400 Hits - Metal Hatchet, 167 Hits - Pickaxe, 11-12 - Grenades, 1-2 Charges - C4 Wood Wall: 11-12 - Grenades, 2 - Charges C4 Wood Pillar: Only by decay Wood Stairs: 54 Hits - Metal Hatchet, 23 Hits - Pickaxe, 11 - Grenades, 1 Charge - C4 Wood Ramp: 84 Hits - Pickaxe, 10 - Grenades, 1 Charge - C4 Wood Ceiling: Only by decay Wood Foundation: Only by decay Wood Window: 11-12 - Grenades, 1 Charge Wood Window w/ Bars: 2 Charges - C4 Wood Doorway: 11-12 - Grenades, 1-2 Charges - C4 Wood Doorway w/Door Attached: 2 Charges - C4 Wood Door: 200 Hits - Metal Hatchet, 84 Hits - Pickaxe, 6 - Grenades, 1 Charge - C4 Wood Gateway: 5 Charges - C4 Wood Gate: 120 Hits - Pickaxe, 32 - Grenades, 3 Charges - C4 

Metal

Metal Wall: 4 Charges - C4 Metal Pillar: Only by decay Metal Stairs: 1 Charge - C4 Metal Ramp: 1 Charge - C4 Metal Ceiling: Only by decay Metal Foundation: Only by decay Metal Window: 3 Charges - C4 Metal Window w/Bars: 3 Charges - C4 Metal Doorway: 2 Charges - C4 Metal Doorway w/Door Attached: 3 Charges - C4 Metal Door: 11 - Grenades, 2 Charges - C4 (Metal Doors cannot be damaged by melee weapons or guns. Only through explosives.) 

Objects

Wood Barricade: 17 Hits - Pickaxe, 2 Charges - C4 Spike Wall: 25 Hits - Pickaxe, 1 Charge - C4 Large Spike Wall: 100 Hits - Pickaxe, 2 Charges - C4 Small Stash: 5 Hits - Rock, 7 Hits - Stone Hatchet, 4 Hits - Metal Hatchet, 2 Hits - Pickaxe Small Wood Storage Box: 34 Hits - Stone Hatchet, 20 Hits - Metal Hatchet, 9 Hits - Pickaxe, 1 Charge - C4 Large Wood Storage Box: 67 Hits - Stone Hatchet, 40 Hits - Metal Hatchet, 17 Hits - Pickaxe, 3 Charges - C4 Furnace: 34 Hits - Stone Hatchet, 20 Hits - Metal Hatchet, 9 Hits - Pickaxe, 2 Charges - C4 Workbench: 67 Hits - Stone Hatchet, 40 Hits - Metal Hatchet, 17 Hits - Pickaxe, 3 Charges - C4 Camp Fire: 34 Hits - Stone Hatchet, 20 Hits - Metal Hatchet, 9 Hits - Pickaxe, 1 Charge - C4 Sleeping Bag: 34 Hits - Stone Hatchet, 20 Hits - Metal Hatchet, 9 Hits - Pickaxe, 1 Charge - C4 
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The playrust wiki () lists all the items and what can be broke on every individual page from that list. For example, for the wood door :

Wood Doors are destructable - they can be taken down when it has been hit 200 times with a rock or 80 times with a pick axe.

The wiki will also tell if sometimes item can't be destroyed. However, they might despawn under certain conditions.

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