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