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.
Complete "Train"
Fall and respawn once
Complete "Mansion"
Complete "Carry"
Complete "Mountain"
Complete "Demolition"
Complete "Castle"
Complete "Water" diving feet-first
Complete "Water" diving head-first
Complete "Power Plant"
Complete the game start-to-end in one run
Stand on the head of the statue in the intro
Take a big shortcut in the level "Mansion"
Place 5 pieces of debris in a dumpster
Align a flipped bench with a wall
Jam a door and go through it in "Carry"
Stack all 4 boxes in the level "Carry"
Use the rope to go above the abyss in the level "Mountain"
Get rid of the speaker set in "Mountain"
Collect all gems into a pile in "Mountain"
Use the window on your left instead of smashing the wall in "Demolition"
Unleash the boulder gate in "Demolition"
Break 4 walls without using any gadgets in "Demolition"
Launch yourself with the catapult in "Castle"
Ring the castle bell in "Castle"
Zipline from the church tower in "Castle"
Parkour fluidly from the alley to the blacksmith in "Castle" without touching the ground.
Use the row boat to get to the cargo ship in "Water"
Enter the dock with the ship backwards in "Water"
Light up the lighthouse in "Water"
In "Water", get out of the water in 100ms to avoid drowning
Don't get wet while surfing down the mountain in "Water"
Short-circuit the wires in "Power Plant"
Feed an appliance with power from 3 batteries in "Power Plant"
Deliver 10 pieces of coal to the main island in "Power Plant"
Steal the battery from the statue in "Power Plant"
Travel 1km
Travel 10km
Travel 25km
Respawn 100 times
Jump 1000 times
Climb 100m
Carry objects for a total of 1000m
Drown 10 times
Use any of the boats to travel 1km
Use any of the ground vehicles to travel 1km
Ride 50m in a dumpster
Zip line down from the mountain in "Christmas" using a candy cane
Land in the snow fort in "Christmas" on a snowboard
Shoot the Christmas angel off the tree top in "Christmas"
Stand atop the large snowman's hat in "Christmas"
Complete "Steam"
Reach the big wheel in "Steam" without using the crane controls
Ride 3 complete revolutions of the big wheel in "Steam"
Break the ladder in "Steam"
Complete "Factory"
Throw all four radios off the level in “Factory”
Complete the first half of “Factory” without turning any lights on
Throw one of each item in the final room into the fire in “Factory”
Complete "Thermal"
Complete "Thermal" while holding a gold bar
Enter the compound in "Thermal" without passing through the main gate
Attach all electrical cables in 35 seconds or less in "Thermal"
Complete "Ice"
Complete the slope jump in "Ice" with 2 snowboards strapped to your feet
Complete the seesaw puzzle in "Ice" without using an ice cube
Complete 1 complete revolution on the ski chairs in "Ice"
Complete "Aztec"
Climb to the top of the tree with the birds nest in “Aztec”
Walk on the rolling ball to bypass a puzzle in “Aztec”
Pass the pendulum obstacle course in 60 seconds in “Aztec”
Complete "Dark"
Climb the Clock Tower in 40 seconds in "Dark"
Hold on to the EXIT lid after you flick the switch in "Dark"
Complete "Dark" without moving any planks that are barring doors
Destroy the statue
Light the marshmallows over the bonfire
Don't let the ice block melt
Complete "Forest"
Complete “Laboratory”
Hit all targets without missing a single shot
Throw an orb into the lava
Reach the exit door whilst holding an orb in the launch pad room
Complete Lumber
Use two hooks when crossing the chasm in Lumber
Wet the bed in Lumber
Throw the lanterns off the map
Complete "City" level
Complete all 4 bowling lanes
Ride one of the vehicles for 10 seconds
Knock all 3 rag dolls off the level
Reach the heavenly palace
Unite all 12 Zodiac heads
Craft 3 different magical item in the golden furnace
Collect the Golden Sycees from the fortune tree
Complete "Golf"
Using ONLY the golf club, putt the ball in 3 strokes or less
Take the alternate route above the cave
Drive the golf cart off the edge of the level
Turn on the jukebox in "Red Rock"
Use the sewer to escape the junkyard on "Redrock"
Place the hat on the cactus in "Red Rock"
Complete "Red Rock"
Go fishing in "Tower"
Use the pipe to cross the lava in "Tower"
Find a shorter route for moving the batteries in "Tower"
Complete "Tower"
Complete "Miniature"
Reach the highest platform above the power drill in "Miniature"
Get rid of the ash in "Miniature"
Starting from the bag of soil, reach the top of the crate without touching the red tiles in "Miniature"
Attempt to use an improvised battery in "Copper World"
Form an independent laser loop in "Copper World"
Throw all four hidden coins off the level in "Copper World"
Complete "Copper World"
Complete "Port"
Light the beacons in "Port"
Clear out the room directly after the zipline in "Port"
Reach the hidden island in "Port"
Complete "Underwater"
Use the spring boards to get across the chasm
Find the speed boat
Go above the cave in "Underwater"