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