Here is the full list of all 63 Human Fall Flat Legacy (Windows) achievements worth 1,000 gamerscore.
Travel 10km
Jump 1000 times
Respawn 100 times
Drown 10 times
Use any of the ground vehicles to travel 1km
Carry objects for a total of 1000m
Climb 100m
Travel 1km
Complete "Mansion" through to "Aztec" start-to-end in one run
Complete "Ice"
Complete 1 complete revolution on the ski chairs in "Ice"
Hold on to the EXIT lid after you flick the switch in "Dark"
Complete "Water" diving feet-first
Light up the lighthouse in "Water"
Complete "Steam"
Ride 3 complete revolutions of the big wheel in "Steam"
Reach the big wheel in "Steam" without using the crane controls
Break the ladder in "Steam"
Complete "Dark"
Complete "Dark" without moving any planks that are barring doors
Complete "Aztec"
Pass the pendulum obstacle course in 60 seconds in “Aztec”
Walk on the rolling ball to bypass a puzzle in "Aztec"
Climb to the top of the tree with the birds nest in “Aztec”
Complete "Power Plant"
Deliver 10 pieces of coal to the main island in "Power Plant"
Feed an appliance with power from 3 batteries in "Power Plant"
Steal the battery from the statue in "Power Plant"
Short-circuit the wires in "Power Plant"
Complete "Water" diving head-first
Zipline from the church tower in "Castle"
Complete "Demolition"
Break 4 walls without using any gadgets in "Demolition"
Unleash the boulder gate in "Demolition"
Use the window on your left instead of smashing the wall in "Demolition"
Don't get wet while surfing down the mountain in "Water"
Parkour fluidly from the alley to the blacksmith in "Castle" without touching the ground.
Climb the Clock Tower in 40 seconds in "Dark"
Complete the slope jump in "Ice" with 2 snowboards strapped to your feet
Complete the seesaw puzzle in "Ice" without using an ice cube
Enter the dock with the ship backwards in "Water"
Use any of the boats to travel 1km
Use the row boat to get to the cargo ship in "Water"
In "Water", get out of the water in 100ms to avoid drowning
Complete "Castle"
Launch yourself with the catapult in "Castle"
Ring the castle bell in "Castle"
Complete "Mountain"
Get rid of the speaker set in "Mountain"
Use the rope to go above the abyss in the level "Mountain"
Collect all gems into a pile in "Mountain"
Complete "Carry"
Stack all 4 boxes in the level "Carry"
Jam a door and go through it in "Carry"
Complete "Train"
Align a flipped bench with a wall
Place 5 pieces of debris in a dumpster
Ride 50m in a dumpster
Complete "Mansion"
Stand on the head of the statue in the intro
Take a big shortcut in the level "Mansion"
Fall and respawn once
Travel 25km