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