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