Ratchet & Clank: Up Your Arsenal/Controls

You can change the controls in the Options Menu at any time to one of the other preset button maps (you can't choose your own, unfortunately) but the default one is the best for a starting player.

These are the default controls, in context with the Third-Person Camera:

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Left Analogue Stick/D-Pad - Move/Move target reticle

Right Analogue Stick - Move camera

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X - Jump

Circle - Fire weapon

Square - Wrench attack

Triangle - Quick Select

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L1 - Aim/Scope

L2 - Strafe (hold down and move normally)

R1 - Zoom out (when in scope)/Crouch

R2 - Zoom in (when in scope)/Strafe

Advanced Moves
When jumping:

X, then X again whilst in mid-air - Double Jump

X, then X again, and hold - Double Jump and Glide

X, then X again (near a wall) - Wall Jump (use this to get up Jump Slots)

L2 and/or R2 and X (whilst moving sideways) - Side-flip

L2 and/or R2 and X (whilst moving backwards) - Back-flip

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Special wrench moves:

Square three times in quick succession - Wrench Combo

X, then square - Hyper-strike (a downwards wrench attack that's roughly twice as powerful as a normal attack)

R1, then X - Comet-strike (throw your wrench - useful against enemies with close-range weapons)

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Other:

L2 and R2 - Lock-On (explained under Weapons)