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