Steam achievements were implemented in the game.
Here is a list of the achievements that were added:
Global
Score 10 goals: Score 10 goals throughout the game
Score 50 goals: Score 50 goals across the game
Score 100 goals: Score 100 goals across the game
Headshot: Kick someome in the head with the ball
Sniper: Perform 10 headshots
Humiliation: Win a match something zero
Game Winning Goal: Win a match by one point
Forest clearing
Heavy Drinker: Remove all beercans from the cooling containers in the forest
Fencing Champ: Remove all beercans from the fences in the forest
City Rooftop
Heavy rain: Kick the ball down into the streets from the rooftop
Inemuri: Lie down on a bench for 2 seconds on the rooftop
Strike!: Topple all the beercans on the rooftop
Cargo Ship
Bait: Kick the ball into the ocean on the ship
Castaway: Remove all floatation devices from the railings on the ship
Polar Station
Snowmen: Disassemble both snowmen on the Polar Station level
Ping: Hit a penguin with the ball
Serial Pinger: Hit all the penguins with the ball
Snow Angel: Lie in the snow for 10 seconds
Hypothermia: Lie in the snow for 1 minute
For now, achievements are all visible. Let me know which ones you think should be hidden/secret achievements.