Here is the full list of all 68 Tannenberg achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
In a single life, take damage from melee attacks and gun shots from a player or players, before being killed by someone entirely different.
Cut off at least 3 enemy sectors.
Complete a match on a snowy map.
Become cut-off in a sector.
Issue 10 command orders.
Perform a role switch.
Capture 10 enemy sectors.
Playing as the Entente Powers, capture the enemy HQ.
Complete a match on a foggy map.
Get killed by your own grenade.
Resupply your ammo.
Win 25 Gold Medals.
Make 5 kills within the first two minutes of the match.
Get 50 artillery kills using trench phones.
Playing as the Infanterie, win a battle in East Prussia.
Kill 25 enemies with a HMG.
Be part of the top scoring squad in a match.
Playing as the Central Powers, capture the enemy HQ.
Get the first kill in a match.
Complete a match on a night map.
Call in Artillery or Recon from a sector.
Kill 5 NCO's in a match.
Kill 10 people with a heavy machine gun in a single life.
Kill 4+ enemies in a capture zone.
Visit every sector in a Maneuver match.
Have a look at the overview map.
Unlock all specializations for the Frontovik.
Unlock all specializations for the Cossacks.
Unlock all specializations for the K.u.K. Trupp.
Unlock all specializations for the Infanterie.
Kill an enemy while shooting through an object.
Die 10 seconds after spawning.
Die from falling down.
Get a kill while injured.
Shoot an enemy while being suppressed or shaken by artillery.
Get 7 squad spawns on a single life as NCO.
Capture an enemy sector alongside 10 or more other people.
Be the first to get killed by an enemy in a game.
Damage two enemies with one bullet.
Win 10 games as the Central Powers.
Win 10 matches as the Entente Powers.
Playing as the K.u.K, lose a battle in the Carpathians.
Get a kill from 150m.
Check out the credits screen.
Used voice commands 50 times.
Used voice chat.
Have your entire squad agree on a vote to change the squad name or type.
Switch to other team when asked for autobalance.
Chop off someone's limbs with a sword.
Fight in every weather condition.
Start a private match.
Exhaust all your revolver ammo without missing a shot.
Make a successful retreat
Using a sword, kill an opponent who is also using a sword.
Kill 4 enemies with a single grenade or call in.
Kill 3 people with a sabre in an enemy held capture zone.
Kill 25 enemies with artillery as the Entente Powers.
Kill 25 enemies with artillery as the Central Powers.
Win a game with a points difference of 100 or less.
Get killed by bots 50 times.
As Frontovik, while crouched, get 3 grenade kills.
Get 10 kills with swords.
Kill an enemy soldier manning a heavy machine gun with a head shot.
Club someone to death with binoculars.
Kick a bot off of a heavy machine gun.
Unlock all specializations for the Roumanians
Unlock all specializations for the Bulgarians
Unlock all specializations for the Latvians.