From Redditor EagleFly_5.
EU players get an Excelsior/Dicker Max, NA ones get a Churchill III.
Americas server (left): Step (0) – Fight 1 battle, get 7 days of premium account. Step 1 – Play 15 battles Reward: 10x Large Repair Kits, 500,000 Silver, 500 Gold Step 2 – Win 10 battles Reward: 10x Large Medikits, 500,000 Silver, 500 Gold Step 3 – Earn 25,000 Experience points over any number of battles Reward: 10x Automatic Fire Extinguishers, 500,000 Silver, 500 Gold + Tier V Churchill III Total Rewards: 1.5 Million Silver, 1,500 gold, 10 Large Repair Kits/Auto. Fire Extinguishers/Medical Kits, Churchill III Premium Tank (or 1500 gold if you have it. – Complete by January 1 to receive tank.
European Server (right & the last pic): Mission 1: “Boot Camp” – Play One Battle and receive your reward instantly. Easy! – Reward – 7 Days Premium Account. Mission 2: “Welcome Back, Commander” – Win or Loss after 15 battles you have unlocked your next mission. Reward, 500.000 credits, 500 gold, 10 Large Repair Kits. Mission 3: Victory is Needed: Win 10 battles and move on. Easy! Reward: 500.000 credits, 10 Large Medical Kits, 500 gold. Mission 4: Field Experience is Key: You are almost there. Earn 25,000 experience over any number of battles. Reward: 500.000 credits, 10 Automatic Fire Extinguishers, 500 gold. Mission 5: Well Done, Commander! – Login, play one battle, and receive your reward! Roll Out! – Reward: Dicker Max, Tier 6 German Premium Tank Destroyer. Total Rewards: 1.500 gold, 7 days Premium Account, 10 Automatic Fire Extinguishers/Large Repair/Medical Kits, 1,5Million Credits, Tier 6 Dicker Max (or 3.200 gold if already owned).