zustande kommen
to come about
Describes the process through which something arises, is realized, or is brought into being.
Der Vertrag ist nach langen Verhandlungen endlich zustande gekommen.
The contract finally came about after long negotiations.

come about
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to come about
Describes the process through which something arises, is realized, or is brought into being.
Der Vertrag ist nach langen Verhandlungen endlich zustande gekommen.
The contract finally came about after long negotiations.

The word 'zustande' is used almost exclusively in the fixed expressions 'zustande kommen' (to come about) and 'zustande bringen' (to manage to do / bring about). It cannot stand alone.
Wie ist dieser Kompromiss zustande gekommen?
How did this compromise come about?
'Zustande' is an old form of 'zu Stande'. It literally means 'to a standing' or 'into a state'. The expressions therefore describe how something reaches a fixed, realized state.
Es war schwer, die Finanzierung zustande zu bringen.
It was difficult to arrange the financing.
The difference lies in the activity: 'zustande kommen' (to come about) describes a process that happens (passive). 'zustande bringen' (to manage / bring about) describes an action that someone performs actively and often with effort (active).
Ein Kaufvertrag kommt durch Angebot und Annahme zustande.
A purchase contract comes about through offer and acceptance.
'Zustande kommen' (to come about) is often used for things that are the result of a process between several parties, such as 'ein Vertrag' (a contract), 'eine Einigung' (an agreement), 'ein Treffen' (a meeting), or 'eine Koalition' (a coalition).
Nach langen Diskussionen ist eine Einigung zustande gekommen.
After long discussions, an agreement came about.
to reach
'erreichen' and 'zustande' can both have to do with an outcome becoming possible. 'erreichen' is used when a person or group achieves a goal, often through work or effort. 'zustande' almost always appears in fixed expressions like 'zustande kommen' (to come about) or 'zustande bringen' (to manage to do / accomplish something). 'Zustande kommen' emphasizes that something comes into being or becomes possible, for example a meeting or a contract. 'Zustande bringen' emphasizes that someone manages to accomplish something. Learners may confuse the words because both describe a result. A practical guide: you achieve a goal; an agreement, a conversation, or a plan comes about.

Der Termin ist nicht zustande gekommen, weil zwei Personen krank waren.
The appointment did not come about because two people were ill.
Nach vielen Gesprächen haben wir endlich eine Lösung erreicht.
After many discussions, we finally achieved a solution.