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