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