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