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