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