Battlefield 1 ™

Can be done in chapter "Through Mud and Blood" When you get kicked out of the tank to scout. You notice a German tent ahead, search the smaller crates for the dynamite and run ahead. There will be about 7 soldiers here. Sneak up and drop the dynamite between them.

To unlock this you have to complete 2 operations:

Red Tide
Brusilov Offensive

Maps you need to play to get this achievement:

Brusilov Keep
Albion
Lupkow Pass
Galicia
Tsaritsyn
Volga River

Weapons you need the kills:

• Sjogren Inertial Factory - Assault Class
• Ribeyrolles 1918 Factory - Assault Class
• RSC 1917 Factory or RSC 1917 Optical - Medic Class
• Chauchat Low Weight or Chauchat Telescopic - Support Class
• Lebel Model 1886 Sniper or Lebel Model 1886 Infantry - Scout Class

You can either pick them up from enemy if they drop or unlock urself.
To unlock:

Assault Class
Sjogren Inertial Factory

• Perform 50 kills with the Model 10-A Slug this must be done first
• In a round, perform 15 kills with the M97 Trench Gun Hunter
  Ribeyrolles 1918 Factory
• Perform 50 kills with the Automatico M1918 Factory
• Perform 20 headshots with the MP 18 Optical

Medic Class
RSC 1917 Factory - Medic Class

• Perform 50 kills with the M1907 SL Sweeper
• Perform 50 revives
  RSC 1917 Optical - Medic Class
• In a round, perform 15 kills with the Autoloading 8 .35 Factory
• Perform 75 heals

Support Class
Chauchat Low Weight

• Perform 50 kills with the Lewis Gun Suppressive
• Perform 75 resupplies
  Chauchat Telescopic
• In a round, perform 15 kills with the M1909 Benet-Mercie Telescopic
• Perform 10 kills with the mortar

Scout Class
Lebel Model 1886 Sniper

• In a round, perform 5 headshots with the Russian 1895 Sniper
• Perform 10 periscope spot assists
  Lebel Model 1886 Infantry
• Perform 50 kills with the Gewehr M.95 Infantry
• Perform 20 spot flare assists

Below I will explain each classes requirements to unlock the weapon.

Assault
Maschinenpistole M1912
-Perform 50 kills with Automatico M1918 Storm
-Destroy 5 boats with the AT Rocket Gun

M1917 Trench Carbine
-Perform 15 kills with sidearms
-Perform 5 multikills

Medic
Farquhar-Hill Optical
-Perform 25 headshots with the Farquhar-Hill Storm
-Complete 20 squad orders

Farquhar-Hill Storm
-Perform 25 kills with the M1907 SL Trench
-In a round, perform 10 revives

Support
M1917 MG Low Weight
-Perform 25 kills with the BAR M1918 Trench
-Perform 250 vehicle damage using explosives

M1927 MG Telescopic
-Perform 50 kills with the M1917 MG Low Weight
-Perform 1500 points of suppression with any LMG

Scout
Type 38 Arisaka Infantry
-Perform 25 counter sniping kills
-As a scout, perform 3 multikills

Carcano M91 Carbine
-Perform 25 kills with the Gewehr M.95 Carbine
-Destroy 5 explosives

Melee weapon
Naval Cutlass
-Capture 20 flags while in a boat
-Perform 15 kills on swimming enemies

Below I will explain each classes requirements to unlock the weapon.

Assault
RSC SMG Factory
-Perform 50 kills as an Assault

RSC SMG Optical
-Perform 50 kills with the RSC SMG Factory
-In a round, perform 300 Vehicle Damage using explosives

Medic
Howell Automatic Factory
-Perform 50 kills as a Medic

Howell Automatic Sniper
-Perform 50 kills with the Howell Automatic Factory
-In a round, perform 600 points of healing

Support
IMG 08/18 Low Weight
-Perform 50 kills as a Support

IMG 08/18 Suppressive
-Perform 50 kills with the IMG 08/18 Low Weight
-In a round, perform 100 resupplies

Scout
Ross MkIII Marksman
-Perform 50 kills as a Scout

M1917 Enfield Infantry
-Perform 50 kills with the Ross MkIII Marksman
-Accumulate 2,500 metres of headshots using Single-Action rifles

Sidearm
Revolver MkVI
-Kill 25 different enemies using Revolvers

melee
Broken Bottle
-Get 5 kills with the Wine Bottle

Below I will explain each classes requirements to unlock the weapon.

Assault
Model 1900 Factory

• Perform 40 kills with the M97 Trench Gun Backbored
• In a round, perform 5 kills with the AT Rocket Gun

Model 1900 Slug

• Perform 50 kills with the 12G Automatic Extended
• Perform 20 kills with the Gasser M1870 Pistol

SMG 08/18 Factory

• Perform 15 kills with the MP188 Trench
• Perform 10 kills with the Anti-Tank Grenade

SMG 08/18 Optical

• Perform 50 Kills with the Automatico M1918 Trench
• Destroy 5 tanks with the Anti-Tank Mine

Medic
Fedorov Avtomat Optical

• Perform 50 kills with the Selbastlader M1916 Optical
• Perform 20 Kills with the C96 Pistol

Fedorov Avtomat Trench

• Perform 40 Kills with the Cei-Rigotti Trench
• Perform 40 squad heals

General Liu Rifle Factory

• Perform 40 kills with the Mondragon Storm
• Perform 30 squad revives

General Liu Rifle Storm

• Perform 50 kills with the Autoloading 8 .35 Marksman
• Perform 30 kills with the Rifle Grenade FRG

Support
Parabellum MG14/17 Low Weight

• Destroy 2 airplanes with LMGs
• Perform 20 killes with the Mortar Airburst

Parabellum MG14/17 Suppresive

• Perform 40 kills with the Lewis Gun Low Weight
• Perform 50 vehicle repairs

Perino Model 1908 Defensive

• Perform 50 kills with the Bar M1918 Storm
• Perform 20 kills with the Repetierpistole M1912 Pistol

Perino Model 1908 Low Weight

• Perform 40 kills with the MG15 n.A. Low Weight
• In a round, Perform 10 squad resupplies

Scout
Mosin-Nagant M91 Infintry

• In a round, perform 3 headshot kills with the SMLE MkIII Infantry
• Perform 20 kills with the Mars Automatic Pistol

Mosin-Nagant M91 Marksman

• Perform 50 kills with the Gewehr 98 Marksman
• Perform 15 kills with the Tripwire Bomb HE

Vetterli-Vitali M1870/87 Carbine

• Perform 50 kills with the SMLE MkIII Carbine
• Destroy 1 vehice with K bullets

Vetterli-Vitali M1870/87 Infantry

• Perform 15 kills with the M1903 Experimental
• Perform 20 periscope spot assists

Pistols
Nagant Revolver

• Perform 20 kills with the Luger P08 pistol

Obrez Pistol

• In a round, perform 5 kills with the MLE 1903 Pistol

Pilot/Tanker:
"C93 Carbine"
-Perform 40 kills with the FT Light Tank