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