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