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