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