Every difficulty setting has unique unlockable rankings that may be unlocked depending on your performance throughout the game. Below are the possible unlockable rankings and the requirements to unlock them.
Ranking | How to unlock
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| - Tanker: 1 alert, Plant: 2 alerts, Tanker-Plant: 3 alerts.
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- Big Boss - Extreme Difficulty (Tanker-Plant)
| - Radar off, under 3hr clear, Damage: under 10.5, Shots Fired: under 700, under 3 alerts, 0 kills, 0 continues, 0 rations, 0-8 saves, no special items.
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- Capybara - Normal Difficulty
| - Tanker: 5+ hours, Plant: 25+ Hours, Tanker-Plant: 30+ Hours.
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- Cat - Very Easy/Easy Difficulty
| - Tanker: 25+ saves, Plant: 75+ saves, Tanker-Plant: 100 + saves.
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- Chicken - Very Easy/Easy Difficulty
| - Radar: off, 250+ alerts, 250+ kills, 60+ continues, 31+ rations used, 100+ saves.
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- Cow - All Difficulty Levels
| - Tanker: 50+ Alerts, Plant: 200+ alerts, Tanker-Plant: 250+ alerts.
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| - Tanker: 25+ saves, Plant: 75+ saves, Tanker-Plant: 100 + saves.
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- Doberman - Hard Difficulty (Tanker-Plant)
| - Under 3hr clear, under 3 alerts, 0 kills, 0 escapes, 0 continues, 0-3 rations, no special items.
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- Doberman - Normal Difficulty (Tanker-Plant)
| - Radar off, under 3hr clear, Damage: under 10.5, Shots Fired: under 700, under 3 alerts, 0 kills, 0 continues, 0 rations, 0-8 saves, no special items.
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- Eagle - Extreme Difficulty
| - Tanker: 18 minutes or less, Plant: 2hrs 45 min or less, Tanker-Plant: 3hrs or less.
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- Elephant - Normal Difficulty
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- Falcon - Normal Difficulty
| - Tanker: 18 minutes or less, Plant: 2hrs 45 min or less, Tanker-Plant: 3hrs or less.
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- Flying Fox - Hard Difficulty
| - Tanker: 1 alert, Plant: 2 alerts, Tanker-Plant: 3 alerts.
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- Flying Squirrel - Very Easy/Easy Difficulty
| - Tanker: 1 alert, Plant: 2 alerts, Tanker-Plant: 3 alerts.
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- Fox - Extreme Difficulty (Tanker-Plant)
| - Under 3hr clear, under 3 alerts, 0 kills, 0 escapes, 0 continues, 0-3 rations, no special items.
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- Fox - Hard Difficulty (Tanker-Plant)
| - Radar off, under 3hr clear, Damage: under 10.5, Shots Fired: under 700, under 3 alerts, 0 kills, 0 continues, 0 rations, 0-8 saves, no special items.
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- Gazelle - All Difficulty Levels
| - Tanker: 50+ Clearing Escapes, Plant: 100+ clearing escapes, Tanker-Plant: 150+ Clearing Escapes.
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- Giant Panda - Extreme Difficulty
| - Tanker: 5+ hours, Plant: 25+ Hours, Tanker-Plant: 30+ Hours.
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| - Tanker: 18 minutes or less, Plant: 2hrs 45 min or less, Tanker-Plant: 3hrs or less.
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- Hippopotamus - Extreme Difficulty
| - Tanker: 25+ saves, Plant: 75+ saves, Tanker-Plant: 100 + saves.
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- Hound - Easy Difficulty (Tanker-Plant)
| - Radar off, under 3hr clear, Damage: under 10.5, Shots Fired: under 700, under 3 alerts, 0 kills, 0 continues, 0 rations, 0-8 saves, no special items.
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- Hound - Normal Difficulty (Tanker-Plant)
| - Under 3hr clear, under 3 alerts, 0 kills, 0 escapes, 0 continues, 0-3 rations, no special items.
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| - Tanker: 50+ Enemies killed, Plant: 200+ Enemies killed, Tanker-Plant: 250+ Enemies killed.
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- Koala - Very Easy/Easy Difficulty
| - Tanker: 5+ hours, Plant: 25+ Hours, Tanker-Plant: 30+ Hours.
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- Mammoth - Hard Difficulty
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- Mouse - Normal Difficulty
| - Radar: off, 250+ alerts, 250+ kills, 60+ continues, 31+ rations used, 100+ saves.
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- Night Owl - Extreme Difficulty
| - Tanker: 1 alert, Plant: 2 alerts, Tanker-Plant: 3 alerts.
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- Orca - Extreme Difficulty
| - Tanker: 50+ Enemies killed, Plant: 200+ Enemies killed, Tanker-Plant: 250+ Enemies killed.
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- Ostrich - Extreme Difficulty
| - Radar: off, 250+ alerts, 250+ kills, 60+ continues, 31+ rations used, 100+ saves.
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- Pig - Very Easy/Easy Difficulty
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- Pigeon - All Difficulty Levels
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- Piranha - Very Easy/Easy Difficulty
| - Tanker: 50+ Enemies killed, Plant: 200+ Enemies killed, Tanker-Plant: 250+ Enemies killed.
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| - Radar: off, 250+ alerts, 250+ kills, 60+ continues, 31+ rations used, 100+ saves.
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- Sea Louce - All Difficulty Levels
| - Beat the game with a Sea Louce in your inventory.
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- Shark - Normal Difficulty
| - Tanker: 50+ Enemies killed, Plant: 200+ Enemies killed, Tanker-Plant: 250+ Enemies killed.
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| - Tanker: 5+ hours, Plant: 25+ Hours, Tanker-Plant: 30+ Hours.
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- Swallow - Very Easy/Easy Difficulty
| - Tanker: 18 minutes or less, Plant: 2hrs 45 min or less, 3hrs or less.
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- Whale - Extreme Difficulty
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| - Tanker: 25+ saves, Plant: 75+ saves, Tanker-Plant: 100 + saves.
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