Chop down your first tree.

Kill a Counter-Terrorist while he is defusing the bomb

Win five matches on Shorttrain

Kill an enemy who is on gold knife level with your own knife in Arms Race Mode

Win a round by defusing a bomb

Kill 100 enemies with the MAC-10

Plant a bomb within 25 seconds (excluding Demolition mode)

Kill an airborne enemy while you are also airborne

Kill 100 enemies with the SG553

Kill 100 enemies with the M249

Kill 100 enemies with the Glock-18

Kill 100 enemies with the G3SG1

Kill 100 enemies with the FAMAS

Win five matches in Arms Race Mode on Shoots

Kill 25 enemies with the Dual Berettas

Kill an enemy within three seconds after they recover a dropped bomb

Play 100 matches of Arms Race or Demolition mode

Win five matches on Safehouse

Use Dual Berettas to kill an enemy player that is also wielding Dual Berettas

Win five matches on St. Marc

Kill an enemy who has killed a player on your friends list in the same round

Kill 250 enemies with headshots

Do at least 95% damage to an enemy who is then killed by a another player

Kill two enemy players with a single bullet

Get kills with five different guns in a single round

Win 200 rounds

Kill 500 enemies

Win 20 games.

Enter 4 different portals without touching the ground in co-op

Show that pit who's boss

Kill an enemy while at 1 health

Kill 20 enemies while you are on fire.