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List This article is a list of things. |
This page lists stamps obtainable by playing System Defender. The stamps were first released on January 14, 2011, and there are currently 16 available.
| Name | Description | Released Date | Difficulty | Image |
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| Ready For Duty | Finish G's tutorial | January 14, 2011 | Easy | 
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| Garbage Disposal | Destroy 100 enemies in 1 level | Easy | 
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| Bug Overload | Protect the EPF mainframe from rogue bugs | Easy | 
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| Strategic Success | Destroy 100 enemies without upgrading cannons | Medium | 
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| Mono Mechanic | Complete a game with only one type of cannon | Medium | 
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| Tactical Pro | Destroy 100 enemies without taking damage | Medium | 
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| Master Mechanic | Fill every open socket with a cannon | Medium | 
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| Herbert Attacks | Complete the level 'Herbert Attacks' | January 27, 2011 | Medium | 
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| Klutzy Attack | Protect the EPF mainframe from Klutzy | February 24, 2011 | Medium | 
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| Strategic Master | Destroy 250 enemies without upgrading | January 14, 2011 | Hard | 
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| Tactical Ace | Destroy 250 enemies without taking damage | Hard | 
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| Test Bot Trio | Protect the EPF mainframe from the Test Bots | February 10, 2011 | Hard | 
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| Protobot Attack | Protect the EPF mainframe from Ultimate Protobot | January 14, 2011 | Hard | 
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| Energy 9999 | Reach Maximum Energy (unreleased) | N/A | Hard | 
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| Track Herbert | Complete the level 'Track Herbert' | August 18, 2011 | Extreme | 
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| Elite Mechanic | Upgrade all cannons in all sockets (unreleased) | N/A | Extreme | 
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| Strategic Expert | Destroy 1000 enemies without upgrading (unreleased) | Extreme | 
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