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