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