A Mark I Welrod Pistol, can used for stealth kills at close range. The weapon is incorrectly depicted with the front sight at the muzzle rather than halfway along the weapon, a configuration only found on a Mark II.
Colt M1911A1
The M1911A1 is the first handgun you unlock, it isn't suppressed but has a higher ROF than the Welrod.
Luger P08
Webley Mk VI
The Webley Mk VI is added by The Neudorf Outpost Pack DLC.
The only semi auto rifle that can be aquired without DLC. Strangely the magazine holds only 7 rounds compared to the real world 10.
Karabiner 98k
Pre-order bonus, unlocked from the start, or with purchase of the "Kill Hitler" DLC.
SVT-40
Pre-order bonus, unlocked from the start, or with purchase of the "Kill Hitler" DLC. Semi-auto with 10 round mag.
Lee-Enfield No.1 Mk.III*
The Lee-Enfield No.1 Mk.III* is added by "The Landwehr Canal Pack" DLC. It is the fastest bolt action rifle in the game.
Arisaka Type 99
The Arisaka Type 99 is added by "The Landwehr Canal Pack" DLC. The choice of the Type 97 is odd, as the entire game takes place in the European Theater, however it is arguable that an elite operative on such an operation would be able to choose any gear they so wished.
M1 Carbine
A scoped M1 Carbine is added by "The Neudorf Outpost Pack" DLC.
The Sturmgewehr 44 is added by "The Landwehr Canal Pack" DLC as the MP44. It's accuracy is relatively poor, and as ammunition can't be found on dead foes, it is a poor choice.
First found in the 4th mission with round drum. Has the biggest magazine and highest ROF of any SMG.
Blyskawica
The Blyskawica submachine gun is added by the St. Pierre DLC.
Machine Guns
MG42
MG42s are seen throughout the game as emplaced weapons.
Grenades
Model 24 Stielhandgranate
First grenade the player unlocks.
F-1 hand grenade
Found in 4th mission, more powerful but less throwing distance.
Type 97
The Japanese Type 97 grenade is used in game as a booby trap. The choice of the Type 97 is odd, as the entire game takes place in the European Theater, however it is possible the developers wanted to visually differentiate trip mines from the other grenades.
Others
Panzerfaust
Found in mission 7 and 9, the Panzerfaust is a German, single shot, anti-tank weapon. It cannot be unlocked, and fills up the secondary weapon slot when picked up.
Lee Enfield No.4 Mk 1
In some of the missions which feature Russians, Lee Enfield rifles can be seen propped up against crates in Russian camps. It is unusable, cannot be picked up or unlocked (it is also worth mentioning that the Lee Enfield was most likely intended to be part of the game, as sound files for it can be found in the game's directory).