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