Here is the full list of all 590 Pain Train achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Complete 12 Levels
Complete 11 Levels
Complete 10 Levels
Complete 9 Levels
Complete 8 Levels
Complete 7 Levels
Complete 6 Levels
Complete 5 Levels
Complete 4 Levels
Complete 3 Levels
Complete 2 Levels
Fire Assault Rifle 130 Times
Fire Assault Rifle 125 Times
Fire Assault Rifle 115 Times
Fire Assault Rifle 120 Times
Fire Assault Rifle 110 Times
Fire Assault Rifle 105 Times
Fire Assault Rifle 100 Times
Fire Assault Rifle 90 Times
Fire Assault Rifle 95 Times
Fire Assault Rifle 85 Times
Fire Assault Rifle 80 Times
Fire Assault Rifle 70 Times
Fire Assault Rifle 75 Times
Fire Assault Rifle 65 Times
Fire Assault Rifle 55 Times
Fire Assault Rifle 60 Times
Fire Assault Rifle 50 Times
Fire Assault Rifle 45 Times
Fire Assault Rifle 40 Times
Fire Assault Rifle 30 Times
Fire Assault Rifle 35 Times
Fire Assault Rifle 25 Times
Fire Assault Rifle 15 Times
Fire Assault Rifle 20 Times
Fire Assault Rifle 10 Times
Fire Assault Rifle 5 Times
Complete 1 Level
Kill 1000 Infected to complete
Kill 998 Infected to complete
Kill 996 Infected to complete
Kill 994 Infected to complete
Kill 992 Infected to complete
Kill 990 Infected to complete
Kill 988 Infected to complete
Kill 986 Infected to complete
Kill 984 Infected to complete
Kill 982 Infected to complete
Kill 980 Infected to complete
Kill 978 Infected to complete
Kill 976 Infected to complete
Kill 974 Infected to complete
Kill 972 Infected to complete
Kill 970 Infected to complete
Kill 968 Infected to complete
Kill 966 Infected to complete
Kill 964 Infected to complete
Kill 962 Infected to complete
Kill 960 Infected to complete
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Kill 950 Infected to complete
Kill 948 Infected to complete
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Kill 930 Infected to complete
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Kill 924 Infected to complete
Kill 922 Infected to complete
Kill 920 Infected to complete
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Kill 912 Infected to complete
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Kill 900 Infected to complete
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Kill 890 Infected to complete
Kill 888 Infected to complete
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Kill 870 Infected to complete
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Kill 866 Infected to complete
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Kill 850 Infected to complete
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Kill 802 Infected to complete
Kill 800 Infected to complete
Kill 798 Infected to complete
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Kill 780 Infected to complete
Kill 778 Infected to complete
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Kill 768 Infected to complete
Kill 766 Infected to complete
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Kill 750 Infected to complete
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Kill 720 Infected to complete
Kill 718 Infected to complete
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Kill 710 Infected to complete
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Kill 706 Infected to complete
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Kill 700 Infected to complete
Kill 698 Infected to complete
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Kill 666 Infected to complete
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Kill 640 Infected to complete
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Kill 636 Infected to complete
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Kill 630 Infected to complete
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Kill 622 Infected to complete
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Kill 610 Infected to complete
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Kill 598 Infected to complete
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Kill 134 Infected to complete
Fire Pistol 104 Times
Fire Pistol 96 Times
Fire Pistol 100 Times
Kill 132 Infected to complete
Fire Pistol 92 Times
Fire Pistol 88 Times
Fire Pistol 84 Times
Kill 130 Infected to complete
Fire Pistol 80 Times
Kill 128 Infected to complete
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Kill 48 Infected to complete
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Kill 44 Infected to complete
Kill 42 Infected to complete
Fire Shotgun 52 Times
Kill 40 Infected to complete
Fire Shotgun 50 Times
Fire Shotgun 48 Times
Kill 38 Infected to complete
Fire Shotgun 46 Times
Fire Shotgun 44 Times
Kill 36 Infected to complete
Fire Shotgun 42 Times
Kill 34 Infected to complete
Fire Shotgun 40 Times
Fire Shotgun 38 Times
Fire Shotgun 36 Times
Kill 32 Infected to complete
Fire Shotgun 34 Times
Fire Shotgun 32 Times
Fire Shotgun 30 Times
Kill 30 Infected to complete
Fire Shotgun 28 Times
Kill 28 Infected to complete
Fire Shotgun 26 Times
Kill 26 Infected to complete
Fire Shotgun 24 Times
Kill 24 Infected to complete
Fire Shotgun 22 Times
Fire Shotgun 20 Times
Fire Shotgun 18 Times
Fire Shotgun 16 Times
Fire Shotgun 14 Times
Fire Shotgun 12 Times
Fire Shotgun 10 Times
Kill 22 Infected to complete
Fire Shotgun 8 Times
Kill 20 Infected to complete
Fire Shotgun 6 Times
Fire Shotgun 4 Times
Fire Shotgun 2 Times
Kill 18 Infected to complete
Kill 16 Infected to complete
Fire Pistol 72 Times
Fire Pistol 76 Times
Fire Pistol 64 Times
Fire Pistol 68 Times
Kill 14 Infected to complete
Fire Pistol 60 Times
Kill 12 Infected to complete
Fire Pistol 56 Times
Kill 10 Infected to complete
Fire Pistol 52 Times
Fire Pistol 48 Times
Fire Pistol 40 Times
Fire Pistol 44 Times
Kill 8 Infected to complete
Fire Pistol 36 Times
Fire Pistol 28 Times
Fire Pistol 32 Times
Kill 6 Infected to complete
Fire Pistol 24 Times
Kill 4 Infected to complete
Fire Pistol 20 Times
Fire Pistol 16 Times
Fire Pistol 12 Times
Kill 2 Infected to complete
Fire Pistol 8 Times
Fire Pistol 4 Times