Here is the full list of all 48 Arrow Heads achievements.
Deflect a Shield Bear's leap attack.
Put 50 arrows into a target dummy.
Get a kill in a minecart.
Fire 200 arrows in a match.
Get your first Ace.
Get your first Saviour.
Kill 2 people with an explosion.
Get your first double kill.
Get your first triple kill.
Get a double kill in the Penguin Skin.
Get hit by a car.
Kill someone by using the stove.
Win a round by all other players committing suicide. (Minimum 3 Player Match)
Get a kill by blowing up the laser eye.
Get a double kill on people in water.
Blow yourself up and kill someone at the same time.
Get a kill while in the vent.
Die by falling into lava.
Kill a person in the vent.
While on fire, set the someone else on fire.
Die from a boulder.
Lose in the first wave of arcade mode.
Get squished by an egg.
Lose in a 1-on-1 by committing suicide.
Complete a match online.
Simultaneously kill the person that killed you, and vice versa.
Unlock your first customization.
Beat arcade level.
Complete your first arena match.
Get stunned by a coconut.
Die from the snowball.
Die from the falling bombs.
Kill 50 bears with Tesla Coil.
Kill 200 bears.
Win a round after bombs have started falling.
Deflect 3 arrows in one round.
Kill someone while ragdolling.
Win a match with under 5% accuracy.
Finish a game with 0 kills, and 10 or more deaths.
Ride the elevator on Cliffside for total of 5 minutes.
Unlock all characters.
Unlock all bows.
Unlock all arrows.
Deflect back and forth 3 times.
Everyone but the winner has at least 9 kills.
Win a match with at least 50% accuracy.
Beat all 25 waves of an arcade map without dying.
Your first perfect game (10 or more kills, 0 deaths).