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