Secret 1: Right at the start go to the right. Behind the last arch there is a HEART

Secret 2: Same as secret 1 but before picking up the grenade launcher. This time there will be a portal that takes you to a secret arena

Secret 3: In the sand pit area, there is a hidden foggy area behind where the scrapjaks appear. A trail of pills will lead you to a secret mega health

Secret 4: Before picking up the laser gun, there is a secret trippy mushroom pill behind the right-most bridge pillar.

Secret 5: Before entering The Arena, to the right of the skill point crate, there is a chainsaw launcher behind a wall that you can walk through

Secret 6: Right after entering The Arena, to the left, there is a window you can jump through, inside there is a LIFE and a recording from TSE

Secret 7: In the house where the cluster bomb upgrade is, there is a bottle of whiskey to the left of the C4 pickup. After taking 3 shots, the secret will activate

Secret 8: To the left of the shielded biomech major, there is an archway near the wall full of bushes, behind the bushes there is a LIFE

Secret 9: Similar to secret 8 but to the left, and without bushes this time. There will be chainsaw launcher ammo

Secret 10: Shoot the large skull to spawn a secret black hole