Everyone on the is jointly and severally liable (unless the lease says otherwise). Meaning everyone is responsible. The collector may elect to sue only one person. But that person would have a right to seek contribution from the others if they paid the full amount due.
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If all four of your signed the lease, all four of your are "jointly and severally" liable for damages under the lease. This means the landlord can pursue just one of you for the full amount of damages, ignoring the others. Pursuing collection of the debt and reporting the debt to credit bureaus are separate things. The landlord can do either, both, or neither. If you are concerned about your liability and your credit, you should consult an experienced lawyer in your area.
Disclaimer: This answer is provided for informational purposes only, does not constitute legal advice, and does not create an attorney-client relationship. Actual legal advice can only be provided after completing a comprehensive consultation in which all of the relevant facts are discussed and reviewed.