Full list of all 102 Rust achievements. It takes around 0-1 hour to unlock all of the achievements in the base game on Windows.
The base game contains 55 achievements, and there are 6 DLC packs containing 47 achievements.
Be in a team where every team member is riding a Boogie Board or Inner Tube (minimum 4 members)
Take a photo of another player
Splash another player with a Water Pistol while that player is irradiated
Soak another player above the damage threshold using a water gun.
Get a kill using a water gun.
Get a kill with a super soaker pumped at the lowest pressure.
Play your first instrument
Play every instrument
Dance with 2 other players at the front of the Cargo Ship.
Use a megaphone while in another player's Tool Cupboard radius.
Record another player speaking onto a Cassette.
Dance near a playing Boom Box on an active Disco Floor.
Stare into a laser light for 30 seconds.
Listen to the Rust soundtrack from a Boom Box for 30 seconds
Play an instrument while floating in an Inner Tube while listening to a Boom Box play a radio stream
Start a fully repaired car with a full set of T3 engine parts
Plant a different seed in every slot in a Large Planter Box
Catch one of every fish
Travel to an underwater lab with a submarine
Wave at 5 different players
Land a Minicopter on the Cargo Ship
Win 3 rounds of poker at Bandit Camp
Complete 5 missions for NPC's
Kill another player with the MLRS
Kill 10 Tunnel Dwellers while on a moving work cart
Kill 3 sharks with a speargun
Travel 3KM with a companion in a Kayak
Watch another player through a CCTV camera
Activate the Excavator
Recycle 10 cars at Junkyard
Pilot a Scrap Transport Helicopter with 5 passengers
Drive a modular car with 5 passengers
Acquire a snowmobile in an Artic Research Base
Complete the Tutorial Island
Build your first boat
Hit another boat with a cannon
Enter the Deep Sea
Kill a player with a weapon on a stolen PT boat
Eat 10 coconuts
Open 5 loot containers on Tropical Islands
Start opening a locked crate on a Ghost Ship
Reach a Floating City