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