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