soldering eternal wire was giving absurd resistance on RTD temperature sensor

Extend both leads by equal lengths.  If extended length is quite long, the increased resistance of the wire may be unavoidable.  28AWG has around 21 ohms per 100m.  Moving to 24 AWG drops to around 8 ohms per 100m.  Solid vs stranded can change these values.  If shortening the leads starts to bring the reading back to what you think is reasonable, you have no other option than using the shorter leads.  Ohms Law is Ohms Law.

Use copper wire.  Dissimilar metals may create a problem.

Both leads go from source and back to microcontroller with no other connections.  No shared return paths for these sensors.

Check for cold solder joints.  Also check ground connections.  If using a shared ground bus but only one 28AWG jumper goes from your buss to your microcontroller... there's your problem.

I was getting resistance because of soldering two wires together. How to solve it. I don't have crimping tool for crimping connector.

Have you used Ohms law? If you have not, then why not?

Have you used an ohmmeter to measure the resistance (and if not, again, why not?). And if you did, why have you not provided this information in your question?

Why are your questions always so lacking in detail?

I'd be interested to see what resistance you're measuring for your setup, and then, when you apply Ohms law, your explanation for how much of a difference you think your setup will make due to the addition of your wire and soldered joints.

Have you used Ohms law? If you have not, then why not?

Have you used an ohmmeter to measure the resistance (and if not, again, why not?). And if you did, why have you not provided this information in your question?

Why are your questions always so lacking in detail?

I'd be interested to see what resistance you're measuring for your setup, and then, when you apply Ohms law, your explanation for how much of a difference you think your setup will make due to the addition of your wire and soldered joints.

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RE: soldering eternal wire was giving absurd resistance on RTD temperature sensor

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I am looking for best solution not temporary solution. Please help me in it.

I don't think the red wire is properly soldered. Check for connectivity first.

If you're convinced you soldered things well, then there's a good chance you've simply got a break in the wire, or those crimped connectors at the wire ends are badly crimped (quite likely if they were purchasd ready-made at very low cost).