Acts 2:38

Jews from all Nations

Changing one's mind from a rejection of Christ to an acceptance of Him as Lord and Christ, the one who died for our sins, and rose again from the dead.

Eternal Salvation is probably in view-"the remission of sins," (vs. 38) as well as temporal salvation-"the saving of oneself from this forward generation" (vs. 40)

Acts 3:19

Men of Israel

Change their mind about what they did through ignorance (vs. 17), they delivered up Jesus (vs. 13), denied him in the presence of Pilate (vs. 13) and chose Barabbas ("a murderer") over Jesus when Pilate offered to release one prisoner (vs. 14).  In addition to this inferential information of what these Jews "thought," Peter adds that Jesus was killed and rose from the dead (vs. 15), that these events fulfilled the law and the prophets (vs. 18).  The only thing that can be inferentially regarded as the object of repentance within this passage is the gospel of Jesus Christ.

That their sins may be blotted out.

Acts 5:31

The high priest and counsel (whom and which Peter was addressing, vs. 27) and "Israel" (vs. 31), the greater focus of Peter's concern.

They must go from rejection of Christ, past indifference, to genuine acceptance of Christ, and faith in Him.

The forgiveness of sins.

Acts 11:18

Cornelius (Acts 10:1)

"Repentance unto life" (Acts 11:18) is equal to  "believ[ing] on the Lord Jesus Christ" in Acts 11:17, which is specifically believing that His death and resurrection (Acts 10:39-41) effects the remission of sins (Acts 10:43)

"The remission of sins" (Acts 10:43) and "life" (Acts 11:18)

Acts13:24

Men of Israel whom Paul addressed (vs. 16) by way of analogy of the repentance demanded by John the Baptist (vs. 24).

The repentance (vs. 24) commanded by John the Baptist is, for those living in Paul's day is equivalent to belief on Jesus (vs. 39), specifically, belief that Jesus was the Son of God (vs. 33) who was slain by Pilate (vs. 28), raised from the dead (vs. 30, 37) by which He offers forgiveness of sins (vs. 38) and justification (39).

"Forgiveness of sins" (vs. 38) and justification (vs. 39).

Acts 17:30

Gentiles on Mars Hill

"We ought not to think that the Godhead is like unto gold, or silver, or stone, graven by art and man's device." (vs. 30)

The motivation to repent is that God will judge the world.  It cannot refer to the temporal judgment on Israel, because these are Gentiles, and it is of the whole world.  It cannot refer to the time of Jacobs troubles, because these men would not be alive to experience that temporal judgment.  It is plainly soteriological in intent. (vs. 31)

Acts 19:4

Old Testament Saints who had believed John the Baptist's message about the coming Messiah

Repentance in vs. 4 is equivalent to " believ[ing] on him which should come after him, that is, on Christ Jesus."

Acts 20:21

Jews and Gentiles

God

Although the consequence of repentance is not expressly stated, Paul speaks of his evangelistic labors on his Missionary trip to Ephesus.  The passage, therefore, is presumptively soteriological in nature.

Acts 26:20 (2x)

The Gentiles

The object of repentance is not explicitly stated, but implicitly said to be  equivalent to believing that Christ should suffer, and rise from the dead (vs. 23).

"To open their eyes, and to turn them from darkness to light, and from the power of Satan unto God, that they may receive forgiveness of sins, and inheritance among them which are sanctified by faith that is in me."  (Acts 20:18)  In addition to this plainly soteriological language, Paul is describing to Agrippa his missionary work among the Gentiles Acts 20:19-20), which is presumably evangelistic in nature.  The context is plainly soteriological in nature.

Romans 2:4

A hypothetical man who judges others for things he himself does.

Self righteousness.  Assuming he is good enough that he is free from God's judgment even though he judges others.

The consequence for not repenting: he "condemns [him]self" (vs. 1) and secures "the righteous judgment of God" in the "day of wrath."

Hebrews 6:1

The subjects repenting are hypothetical converts to Christianity

Repentance from "dead works."

The consequence is not stated, but the three-couplet grouping presumptively shows the repentance to be soteriological in its purpose.

2 Peter 3:9

Scoffers who mock the Christian faith, and the belief in Creation.

The truth of Jesus Christ, of the Creator God, and of judgment to come.

If they do not repent, they will face God's judgment which they mock.