Full list of all 123 Human: Fall Flat achievements. It takes around 15-20 hours to unlock all of the achievements in the base game on Windows.
The base game contains 51 achievements, and there are 18 DLC packs containing 72 achievements.
Stack all 4 boxes in the level "Carry"
Stand atop the large snowman's hat in "Christmas"
Shoot the Christmas angel off the tree top in "Christmas"
Land in the snow fort in "Christmas" on a snowboard
Zip line down from the mountain in "Christmas" using a candy cane
Ride 50m in a dumpster
Place 5 pieces of debris in a dumpster
Complete the game start-to-end in one run
Jam a door and go through it in "Carry"
Take a big shortcut in the level "Mansion"
Deliver 10 pieces of coal to the main island in "Power Plant"
Use any of the ground vehicles to travel 1km
Short-circuit the wires in "Power Plant"
Feed an appliance with power from 3 batteries in "Power Plant"
Steal the battery from the statue in "Power Plant"
Complete "Water" diving head-first
Don't get wet while surfing down the mountain in "Water"
Light up the lighthouse in "Water"
Enter the dock with the ship backwards in "Water"
Zipline from the church tower in "Castle"
Ring the castle bell in "Castle"
Parkour fluidly from the alley to the blacksmith in "Castle" without touching the ground.
Break 4 walls without using any gadgets in "Demolition"
Get rid of the speaker set in "Mountain"
Collect all gems into a pile in "Mountain"
Travel 25km
Align a flipped bench with a wall
Stand on the head of the statue in the intro
Use the row boat to get to the cargo ship in "Water"
Respawn 100 times
In "Water", get out of the water in 100ms to avoid drowning
Use any of the boats to travel 1km
Complete "Demolition"
Unleash the boulder gate in "Demolition"
Use the rope to go above the abyss in the level "Mountain"
Travel 10km
Carry objects for a total of 1000m
Jump 1000 times
Drown 10 times
Complete "Power Plant"
Complete "Water" diving feet-first
Complete "Castle"
Climb 100m
Launch yourself with the catapult in "Castle"
Use the window on your left instead of smashing the wall in "Demolition"
Complete "Mountain"
Travel 1km
Complete "Carry"
Complete "Train"
Complete "Mansion"
Fall and respawn once
Break the ladder in "Steam"
Complete "Steam"
Ride 3 complete revolutions of the big wheel in "Steam"
Reach the big wheel in "Steam" without using the crane controls
Throw one of each item in the final room into the fire in “Factory”
Throw all four radios off the level in “Factory”
Complete "Factory"
Complete the first half of “Factory” without turning any lights on
Complete "Thermal" while holding a gold bar
Complete "Thermal"
Attach all electrical cables in 35 seconds or less in "Thermal"
Enter the compound in "Thermal" without passing through the main gate
Complete the slope jump in "Ice" with 2 snowboards strapped to your feet
Complete "Ice"
Complete 1 complete revolution on the ski chairs in "Ice"
Complete the seesaw puzzle in "Ice" without using an ice cube
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 "Aztec"
Complete "Dark" without moving any planks that are barring doors
Hold on to the EXIT lid after you flick the switch in "Dark"
Climb the Clock Tower in 40 seconds in "Dark"
Complete "Dark"
Complete "Forest"
Destroy the statue
Don't let the ice block melt
Light the marshmallows over the bonfire
Reach the exit door whilst holding an orb in the launch pad room
Complete “Laboratory”
Hit all targets without missing a single shot
Throw an orb into the lava
Complete Lumber
Throw the lanterns off the map
Use two hooks when crossing the chasm in Lumber
Wet the bed in Lumber
Ride one of the vehicles for 10 seconds
Complete all 4 bowling lanes
Knock all 3 rag dolls off the level
Complete "City" level
Reach the heavenly palace
Craft 3 different magical item in the golden furnace
Collect the Golden Sycees from the fortune tree
Unite all 12 Zodiac heads
Take the alternate route above the cave
Complete "Golf"
Drive the golf cart off the edge of the level
Using ONLY the golf club, putt the ball in 3 strokes or less
Turn on the jukebox in "Red Rock"
Complete "Red Rock"
Place the hat on the cactus in "Red Rock"
Use the sewer to escape the junkyard on "Redrock"
Complete "Tower"
Find a shorter route for moving the batteries in "Tower"
Use the pipe to cross the lava in "Tower"
Go fishing in "Tower"
Complete "Miniature"
Starting from the bag of soil, reach the top of the crate without touching the red tiles in "Miniature"
Get rid of the ash in "Miniature"
Reach the highest platform above the power drill in "Miniature"
Complete "Copper World"
Form an independent laser loop in "Copper World"
Throw all four hidden coins off the level in "Copper World"
Attempt to use an improvised battery in "Copper World"
Complete "Port"
Reach the hidden island in "Port"
Light the beacons in "Port"
Clear out the room directly after the zipline in "Port"
Go above the cave in "Underwater"
Complete "Underwater"
Use the spring boards to get across the chasm
Find the speed boat