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