From StrategyWiki, the free strategy guide and walkthrough wiki

• W/A/S/D: Move
• Space: Jump
• Shift: Walk
• Ctrl: Crouch
• Q: Change 1st person/3rd person view (Only available when enabled by room host)
• E: Plant bomb/Pick up item
• Tab: Status
• H: Toggle HUD display
• P: Screenshot
• R: Reload
• Z/X/C: Radio messages
• 1/2/3/4 or : Switch weapons
• : Fire
• : Zoom (Certain weapons only) or change perspective while Spectating
• Enter: Talk
• F3: Normal chat
• F4: Team chat
• F5: Clan chat
• F6: Friend chat