There seems to be a doctrine among certain sects of Christianity that promote the idea of two judgments. However I cannot seem to find biblical justification for this doctrine. I gravitate to the idea of one judgment because of passages like these :
Because he hath appointed a day, in the which he will judge the world in righteousness by that man whom he hath ordained; whereof he hath given assurance unto all men, in that he hath raised him from the dead. (Acts 17:31 KJV)
And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day. (Jude 1:6 KJV)
The DAY OF JUDGMENT is also called the GREAT DAY OF THE LORD.
Part of the confusion could be the millennial reign of Christ. Some place a judgment there at the start of that period, and put another judgment at the end of that period. I could see only biblical support for a judgment a the end of that period. At the beginning of that period Jesus retrieves his saints from wherever they are and these saints rule with him for the millennial period. This is not a judgment, but a resurrection of the just, of the saints of Christ, those chosen from the foundation of the world.
If there is indeed one judgment, then the following doctrines are incorrect:
1. That a man gets a second chance to be righteous.
2. That the Matt 25 judgment of all nations is at the start of the millennial period.