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