Learn Swedish: Laget höll ihop och lyckades nå målet. - The team stuck together and managed to reach the goal.

Yes! Hålla ihop (past tense höll ihop) is a particle verb. While hålla means 'to hold,' adding the particle ihop (together) creates the idiomatic meaning 'to stick together' or 'stay united.' Remember that in particle verbs, the stress falls on the particle, so you would emphasize ihop when speaking.

Why does lyckades end in an -s? Is it passive?

No, it is not passive. Lyckas (to succeed or manage to do something) is a deponent verb. This means it always ends in -s but has an active meaning. The past tense used here is lyckades.

Why is there no att (to) before nå?

When lyckas is followed by another verb to mean 'managed to do something,' it usually links directly to the infinitive of the next verb without the marker att. Therefore, 'managed to reach' is simply lyckades nå.

Does målet only mean a physical goal in sports?

It can mean a sports goal, but just like in English, it is frequently used abstractly to mean a target, aim, or objective. Since mål is an ett word, its definite form ('the goal') is målet.