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