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