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