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