Full Game Walkthrough...

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Artillery	Kill 250 enemies with a big gun.
Bandage	Heal yourself.
Beat 'em up	Kill someone with your fists.
Bug Splat	Kill someone by ramming them with a plane.
Create a Map	Use the Scene Editor to create a Map.
Dead Man Walking	Get a kill while in poisonous gas without a gasmask.
Drill Camp: Artillery	Complete the Artillery Range.
Drill Camp: Grenades	Complete the Grenade Range.
Drill Camp: Sapper	Complete the Sapper Range.
Drill Camp: Shooting	Complete the Shooting Range.
Engineer	Build Constructibles.
Give them the bayonet!	Kill 250 enemies in melee.
Grand Campaign	Win 100 matches.
Grenadier	Kill three or more enemies with a single grenade.
Lazy git	Sit down on a Chair or Bench.
Long and Big	Kill someone with a Big Gun at hundred meters or more.
Look Out!	Crush someone with an object.
Machine Gunner	Kill 1000 enemies with a gun.
One Man Army	Kill 10000 enemies.
Over The Top!	Have the Charge bonus with fifteen other people at the same time.
Over the cliff and far away	Kill someone by pushing them.
Play Instrument	Play an Instrument.
Prospector	Dig 1000 times.
Resuscitation Specialist	Revive 50 teammates.
Road Block	Destroy 50 vehicles.
Roleplaying	Use an emote.
Silly Weapon	Get a kill with a silly weapon.
Single Player	Play a match in Single Player.
Strike!	Get ten or more kills with a single officer call-in.
They couldn't hit an elephant at this distance	Kill someone with a rifle at hundred meters or more.
UnKillable!	Be downed three times in a single life.
Warband Champion	Get five melee kills in a single life.