Here is the full list of all 47 YetiFree achievements.
Knock down a ski lift chair.
Kill 4 skiers with a single ground slam.
Kill a skier with a snow ball.
Kill a skier with a stick.
Use the same snowball to kill 3 skiers.
Use the same snowball to kill 10 skiers.
Use the same stick to kill 3 skiers.
Use the same stick to kill 10 skiers.
Kill three skiers by destroying a single tree.
Avoid triggering an avalanche for 5 minutes.
Survive an avalanche.
Narrowly avoid the avalanche for 5 seconds.
Eat a skier in the middle of a jump.
Start an avalanche.
Destroy 100 trees.
Destroy 100 rocks.
Reach a combo meter of 10.
Reach a combo meter of 25.
Reach a combo meter of 100.
Survive for 10 minutes in a single game.
Survive for 20 minutes in a single game.
Survive for 30 minutes in a single game.
Score at least 100,000 points in a single game.
Score at least 250,000 points in a single game.
Score at least 1,000,000 points in a single game.
Launch off 100 ramps.
Run more than 2 kilometers in a single game.
Behold the awe and majesty that is the birth of an avalanche
Consume a moose and gain it's power
Consume so many moose, they must instead be called meese
Cause a moose to be dynamited
Cause a skier to be killed by dynamite
Cause a ski patrol to be killed by dynamite
Walk peacefully down the slopes
Travel even further on the path of peace
Walk for 5km without harming another creature
Reach a speed of 12m/s
Run more than 10 kilometers in a single game.
Fully clear a 5 gate slalom course.
Fully clear a 10 gate slalom course.
Fully clear a 15 gate slalom course.