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