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